NZ621093B2 - 2 -amino-4 -(pyridin-2-yl)-5, 6-dihydro-4h-1, 3-oxazine derivatives and their use as bace-1 and/or bace - 2 inhibitors - Google Patents

Abstract

The disclosure relates to novel oxazine derivatives of formula (I), and pharmaceutically acceptable salts thereof, in which all of the variables are as defined in the specification, pharmaceutical compositions thereof, combinations thereof, and their use as medicaments, particularly for the treatment of Alzheimer's Disease or diabetes via inhibition of BACE-1 or BACE-2. In one embodiment the compound is 5-cyano-3-methyl-pyridine-2-carboxylic acid [6-((R)-2-amino-5,5-difluoro-4-methyl-5,6-dihydro-4H-[1,3] oxazin-4-yl)-5-fluoro-pyridin-2-yl]-amide. t of Alzheimer's Disease or diabetes via inhibition of BACE-1 or BACE-2. In one embodiment the compound is 5-cyano-3-methyl-pyridine-2-carboxylic acid [6-((R)-2-amino-5,5-difluoro-4-methyl-5,6-dihydro-4H-[1,3] oxazin-4-yl)-5-fluoro-pyridin-2-yl]-amide.

Description

-AMINO (PYRIDINYL) - 5 ‘ OXAZINE DERIVATIVES AND THEIR USE , 6 -DIHYDRO- 4H- 1 , 3 AS BACE-l AND/OR BACE-2 INHIBITORS Field of the invention The invention relates to novel oxazine derivatives and pharmaceutically acceptable salts thereof, pharmaceutical compositions thereof, pharmaceutical combinations f, and their use as medicaments, particularly for the treatment of neurodegeneration via inhibition of BACE-1 or diabetes via inhibition of BACE—2.

Background of the Invention Alzheimer’s Disease is a devastating neurodegenerative disorder. Its sporadic forms affect an elderly tion (sharp increase in incidence at >75 years of age), in addition, there are various familial forms with an onset of the disease in the fourth or fifth decade of life.

Pathologically, it is characterized by the ce of ellular senile s, and intracellular neurofibrillar s in ts brains. The core constituent of the senile plaques are small, 4 kDa amyloid peptides. They are generated by the proteolytic processing of a large transmembrane protein, amyloid precursor protein (APP). Cleavage of APP by beta-secretase (BACE-t) releases the soluble APP-beta fragment, while the 99-amino acid long C-terminus remains tethered to the ne. This C-terminal fragment is subsequently proteolytically processed by gamma—secretase (an membrane multi-enzyme complex) to generate amyloid peptides of various length, inantly 40 and 42 amino acids long (Hardy J, Selkoe DJ (2002) Science; 297 (5580):353-356).

If, under pathologic ions, the generation of these peptides occurs at an increased rate, or if their removal from the brain is disturbed, increased brain amyloid peptide concentrations leads to the formation of oligomers, fibrils and eventually plaques (Farris W, et a/ (2007) Am.J. Pathol.; 171 (1)241—251). It has been shown, that deposition of amyloid peptides and plaques in the brain is the first able event in the enesis of Alzheimers Disease, and that it is the trigger for loss of synapses, synaptic contacts, and neurons (Grimmer T, et at (2009) Neurobiology of Aging; 3O 902-1909). Brain atrophy caused by massive neuron loss is followed by impairments in ion, memory, orientation and the ability to m the tasks of daily living, i.e. clinically manifest dementia (Okello A, et a/ (2009) Neurology; 73 (10):?54-760).

BACE-t, also known as Asp2 or Memapsin 2, is a transmembrane aspartic protease highly expressed in neurons. lt co-localizes with its substrate APP in Golgi and endocytic tments (Willem M, Lammich S, Haass C (2009) Semin.Cell Dev.Biol; 20 (2):175-182). 2012/054269 Knock-out studies in mice have demonstrated the absence of amyloid peptide formation, while the animals are healthy and fertile (Ohno M, et a/ (2007) Neurobiol.Dis.; 26 (1):134—145).

Genetic ablation of BACE-1 in APP-overexpressing mice has demonstrated absence of plaque formation, and the reverse of cognitive deficits (Ohno M, et a/ (2004) Neuron; 41 (1):27-33).

BACE-i levels are elevated in the brains of sporadic Alzheimer’s Disease patients (Hampel H, Shen Y (2009) Scand. J. Clin. Lab. Invest; 69 (1):8-12).

Taken er, these findings suggest that the inhibition of BACE—i may be a favourable therapeutic strategy for the treatment of Alzheimer’s Disease.

Beta—site amyloid precursor protein ng enzyme 2 (BACE-Z) is a embrane aspartic protease that is highly expressed in pancreatic B cells and other peripheral s (Brian D.

Bennett, Safura han, Richard Loeloff, Jean~Claude Louis, Eileen ; Martin Citron, and Robert Vassar (2000) JJ. Biol. Chem. 275( 27) 20647-20651). BACE—2 is closely d to BACE—1 or beta secretase. However, despite structural and ce similarities the substrate specificity of BACE—1 and BACE-2 appear to be different. While AB or B—amyloid peptide is the main substrate of BACE-l, BACE-2 does not generate either form of AB (Vassar, R., Bennett, B. D., Babu-Khan, 8., Kahn, 8., Mendiaz, E. A., Denis, P., Teplow, D. 8., Ross, 8., Amarante, P., Loeloff, R., Luo, Y., Fisher, 8., Fuller, J., Edenson, 8., Lile, J., Jarosinski, M. A., Biere, A. L., Curran, E., Burgess, T., Louis, J.-C., Collins, F., Treanor, J., Rogers, G., and Citron, M. (1999) Science 286, 735—741).

Transmembrane protein 27 (TMEM27 or collectrin) plays an important role in B-cell proliferation and insulin secretion (PinarAkpinar, Satoru Kuwajima, Jan feldt, and Markus Stoffel (2005) Tmem27: Cell Metabolism. 2(6) 385-397) and has been identified as a substrate for BACE-2 (). Tmem27 exists as a dimer and the extracellular domain is cleaved and shed from the plasma in a B cell-specific . Overexpression of full-length Tmem27, but not the truncated or soluble protein, increases [3 cell proliferation, suggesting that the full length protein is required for this biological function. ch1 (hepatocyte nuclear factor-1d ) ls the transcription of TMEM27. Mice with targeted deletion of ch1 exhibit decreased [3 cell mass, and knockdown of Tmem27 using RNAi results in a reduction of cell proliferation.

Transgenic mice with sed expression of Tmem27 in pancreatic B cells exhibit increased (3 cell mass compared to their wild-type Iittermates. This data indicates that TMEM27 plays a role in l of [3 cell mass and that inhibition of BACE-2 which cleaves TMEM27 could be useful for treating loss of B cell mass and on, the underlying cause of diabetes.

Taken together, these findings suggest that the inhibition of BACE-2 may be a favourable therapeutic gy for the treatment and prevention of metabolic disorders d to decreased [3 cell mass and/or function, such as type 2 diabetes.

Oxazine derivatives having BACE-1 and/or BACE-2 ty are described in the literature, for example WO 69934 A1. However, there is an ongoing requirement for further structurally diverse BACE inhibitors which may have improved properties in terms of their inhibitory activity, selectivity, solubility, metabolism, pharmacokinetics and/or safety profile. It may also be advantageous to identify compounds which show selective inhibitory activity for BACE-1 over BACE-2 or BAC E-2 over BACE-1.

Summam of the Invention The present invention therefore relates to novel oxazine derivatives having BACE tory activity, to their preparation, to their medical use and to medicaments comprising them.

More particularly, in a first aspect the ion relates to a compound of the formula (l), or a pharmaceutically acceptable salt thereof: (1), wherein R1 and R2 are independently hydrogen or n; R3 and R4 are independently hydrogen or C1_3alkyl; or R3 and R4 taken together are cyclopropyl; or R1 and R4 are hydrogen and R2 and R3 taken together are -CH2-O~CH2—; R5 is C1-3alkyl, halogen-C1-3alkyl or C1-3alkoxy-C1_3alkyl; and R6 is phenyl or a 5- or 6-membered clic heteroaryl sing 1, 2, 3 or 4 heteroatoms ndently selected from N, O and S, and wherein said phenyl or heteroaryl is optionally substituted by 1, 2, 3 or 4 substituents independently selected from halogen, cyano, amino, hydroxy, CMalkyl, halogen-CMalkyl, halogen-CMalkylthio, halogen-CMalkoxy, CMalkoxy, C1- 4alkoxy-C1.4alkyl, Cmalkoxy-Cmalkoxy, CMalkoxy-CMalkylthio, C14alkoxy-Cg4alkenyl, C1. 4alkoxy-Cg-4alkynyl, hydroxy-C1-4alkyl, hydroxy—Cg4alkenyl and hydroxy—Cyalkynyl.

More particularly, in a second aspect the invention relates to a compound of the a (I), or a pharmaceutically able salt thereof: wherein R1 and R2 are independently en or halogen; R3 and R4 are independently hydrogen or C1_3alkyl; or R3 and R4 taken together are cyclopropyl; R5 is C1_3alkyl, halogen-C1.3alky| or C1-3a|koxy~C1-3alkyl; and R6 is phenyl or a 5- or 6-membered monocyclic heteroaryl comprising 1, 2, 3 or 4 heteroatoms independently selected from N, O and S, and wherein said phenyl or heteroaryl is optionally substituted by 1, 2, 3 or 4 tuents independently selected from halogen, cyano, amino, hydroxy, CMalkyl, halogen-CMaIkyl, halogen—CMalkylthio, halogen-CMalkoxy, CMalkoxy, C1. 4alkoxy-C1_4alkyl, xy-C14alkoxy, CMalkoxy-Cmalkylthio, C14alkoxy-C24alkenyl, C1- 4alkoxy—CHalkynyl, hydroxy—CMalkyl, hydroxy—CHalkenyl and hydroxy—Cyalkynyl.

More particularly, in a third aspect the invention relates to a compound of the formula (I), or a pharmaceutically able salt thereof: wherein R1 and R2 are independently hydrogen or n; R3 and R4 are independently hydrogen or C1-3a|ky|; or R3 and R4 taken together are ropyl; R5 is C1.3alkyl, halogen-C1.3alkyl or C1_3alkoxy-C1_3alkyl; and R6 is phenyl or a 5- or 6-membered monocyclic heteroaryl comprising 1, 2, 3 or 4 heteroatoms independently selected from N, O and S, and wherein said phenyl or heteroaryl is optionally substituted by 1, 2, 3 or 4 substituents independently selected from halogen, cyano, amino, 2012/054269 hydroxy, C1.4alkyl, halogen-CMalkyl, halogen—CMalkylthio, halogen-C1.4alkoxy, CMalkoxy, C1. 4alkoxy-CMalkyl, CMalkoxy-Cmalkoxy and CMalkoxy-CMalkylthio. tions As used herein, the term “CMalkyl” refers to a straight or branched hydrocarbon chain radical consisting solely of carbon and hydrogen atoms, containing no unsaturation, having from one to four carbon atoms, and which is attached to the rest of the molecule by a single bond. Examples of l include methyl, (R)-methyl, ethyl, n—propyl, 1-methylethyl (iso-propyl) n—butyl and 1,1— dimethylethyl (t—butyl). The term “C1-3alkyl” refers to alkyl radicals as defined herein having from one to three carbon atoms.

As used herein, the term "Cualkenyl" refers to a straight or branched hydrocarbon chain radical group consisting solely of carbon and hydrogen atoms, containing at least one double bond, having from two to four carbon atoms, and which is attached to the rest of the molecule by a single bond. Examples of Cgsalkenyl include, ethenyl, prop-t-enyl and enyl.

As used herein, the term “Cz4alkynyl” refers to a straight or branched hydrocarbon chain radical group consisting solely of carbon and hydrogen atoms, containing at least one triple bond, having from two to four carbon atoms, and which is attached to the rest of the molecule by a single bond. Examples of Gwalkynyl include ethynyl, prop-t-ynyl and but-1—ynyl.

As used herein, the term "CMalkoxy" refers to a radical of the formula -O-Ra where Ra is a C1- 4alkyl radical as defined above. Examples of C1.4alkoxy include methoxy, ethoxy, propoxy, isopropoxy, butoxy and isobutoxy. The term “C1-3alkoxy” is to be construed accordingly.

As used herein, the term "CMalkoxy-Cmalkyl " refers to a radical of the a -Ra-O-Ra where each R3 is ndently a CMalkyl radical as defined above. The oxygen atom may be bonded to any carbon atom in either alkyl radical. Examples of CMalkoxy-CMalkyl include methoxy- methyl, methoxy—ethyl, ethoxy-ethyl, 1-ethoxy—propyl and 2-methoxy-butyl. The term “C1-3alkoxy- C1_3alkyl” is to be construed accordingly.

As used herein, the term oxy-CMalkoxy " refers to a radical of the formula -O-Ra-O—Ra where each R2, is independently a CMalkyl radical as defined above. The oxygen atoms may be bonded to any alkyl radical carbon atom. Examples of xy-CMalkoxy include methoxy- y, methoxy—ethoxy, ethoxy—ethoxy, 1-ethoxy—propyoxy and 2-methoxy-butoxy.

As used herein, the term oxy—C14alkylthio“ refers to a radical of the formula -S-Ra-O-Ra where each Ra is independently a Cmalkyl radical as defined above. The oxygen and sulfur atoms may be bonded to any alkyl radical carbon atom. Examples of CMalkoxy-CMalkylthio include methoxy—methylthio, methoxy-ethylthio, ethoxy—ethylthio, 1-ethoxy-propylthio and 2- methoxy—butylthio.

As used , the term "CMalkoxy-Cwalkenyl " refers to a radical of the a —Rb-O—Ra where Ra is a C1.4alkyl l as defined above and Rh is a Cgaalkenyl radical as defined above.

The oxygen atom may be bonded to any carbon atom in the alkyl radical and any carbon atom in the alkenyl radical. Examples of CMalkoxy-Cmalkenyl include methoxy—ethenyl, ethoxy—ethenyl, 3-methoxy—propenyl, 1—ethoxy—propenyl and 2—methoxy—butenyl.

As used herein, the term "C14alkoxy-Cz4alkynyl " refers to a radical of the formula Ra where RE, is a CMalkyl radical as d above and Rb is a Gwalkynyl l as defined above.

The oxygen atom may be bonded to any carbon atom in the alkyl radical and any available carbon atom in the alkynyl radical. Examples of C1-4alkoxy-Cgaalkynyl include methoxy-ethynyl, ethoxy-ethynyl, 3-methoxy-propynyl, 1-ethoxy-propynyl and 2—methoxy-butynyl.

The term "halogen" refers to bromo, chloro, fiuoro or iodo.

As used herein, the term "halogen-CMalkyl" refers to a CMalkyl radical, as defined above, tuted by one or more halo radicals, as defined above. Examples of halogen-Cualkyl include trifluoromethyl, difluoromethyl, fiuoromethyl, trichloromethyl, 2,2,2—trifluoroethyl, 1- fluoromethyl-Z-fluoroethyl, 3—bromo—2-fiuoropropyl and 1-bromomethyl-Z-bromoethyl. The term "halogen~C1.3alkyl“ is to be construed accordingly.

As used herein, the term "halogen-CMalkylthio" refers to a radical of the formula -S-Ra where R8 is a halogen—Cmalkyl radical as defined above. Examples of halogen—CMalkylthio e trifluoromethylthio, difluoromethylthio, fiuoromethylthio, trichloromethylthio, 2,2,2- trifluoroethylthio, 1-fiuoromethyl-2—fiuoroethylthio, 3-bromo~2~fluoropropylthio and 1-bromomethylbromoethylthio.

As used herein, the term "halogen-CMalkoxy" refers to a CMalkoxy l, as defined above, substituted by one or more halo radicals, as defined above. Examples of halogen-CMalkoxy include trifluoromethoxy, difiuoromethoxy, fluoromethoxy, trichloromethoxy, 2,2,2-trifiuoroethoxy, 1-fiuoromethyl-2—fluoroethoxy, 3-bromo—2—fluoropropoxy and 1-bromomethyl-Z-bromoethoxy.

As used herein, the term "heteroaryl" refers to a 5- or 6-membered aromatic monocyclic ring radical which comprises 1, 2, 3 or 4 heteroatoms individually selected from nitrogen, oxygen and sulfur. The heteroaryl radical may be bonded via a carbon atom or heteroatom. Examples of heteroaryl include furyl, pyrrolyl, l, pyrazolyl, olyl, thiazolyl, isothiazolyl, oxazolyl, isoxazolyl, triazolyl, tetrazolyl, pyrazinyl, pyridazinyl, pyrimidyl and pyridyl.

As used herein, the term "hydroxyCMalkyP refers to a CMalkyl radical as defined above, wherein one of the hydrogen atoms of the CMalkyl radical is replaced by OH. es of hydroxyC1_4alkyl include hydroxy—methyl, 2—hydroxy-ethyl, 2—hydroxy—propyl, 3-hydroxy-propyl and 2-hydroxy-butyl.

As used herein, the term "hydroxyCyalkenyV refers to a Gwalkenyl radical as defined above, wherein one of the hydrogen atoms of the C24alkenyl radical is replaced by OH. Examples of hydroxyC1_4a|kenyl include 2—hydroxy—ethenyl, 2-hydroxy—propenyl, 3-hydroxy-propenyl and 2- hydroxy-butenyl.

As used herein, the term "hydroxyCualkynyV refers to a C24alkynyl radical as defined above, wherein one of the hydrogen atoms of the Cgaalkynyl l is ed by OH. Examples of hydroxyC1-4alkyny| include 2-hydroxy—ethynyl, 3-hydroxy—propynyl and 2-hydroxy-butynyl.

As used , the term "a,” "an,” "the” and similar terms used in the context of the present invention (especially in the context of the ) are to be construed to cover both the singular and plural unless otherwise indicated herein or clearly contradicted by the context. The use of any and all examples, or exemplary language (6.9. "such as”) provided herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed.

The term "compounds of the t invention" (unless specifically fied otherwise) refers to compounds of formula (I), (la), (lb) or (Ic), compounds of the Examples, pharmaceutically acceptable salts of such compounds, and/or hydrates or es of such compounds, as well as, all isomers (including reoisomers and omers), tautomers and isotopically labeled compounds (including deuterium). The term “agents of the invention" is ed to have the same meaning as “compounds of the present invention".

PCT/IBZOlZ/054269 As used herein, the term it”, "inhibition" or “inhibiting” refers to the reduction or suppression of a given condition, symptom, or disorder, or disease, or a significant decrease in the ne activity of a biological activity or process.

As used herein, the term "pharmaceutically acceptable carrier" es any and all solvents, sion media, coatings, surfactants, antioxidants, preservatives (e.g., antibacterial agents, antifungal ), isotonic agents, absorption delaying , salts, preservatives, drugs, drug stabilizers, binders, excipients, disintegration agents, lubricants, ning agents, flavoring agents, dyes, and the like and combinations thereof, as would be known to those skilled in the art (see, for example, ton's Pharmaceutical Sciences, 18th Ed. Mack Printing Company, 1990, pp. 1289- 1329). Except insofar as any conventional carrier is incompatible with the active ingredient, its use in the therapeutic or pharmaceutical itions is contemplated.

As used , the term “prevention” of any ular disease or disorder refers to the administration of a compound of the invention to a subject before any symptoms of that disease or disorder are apparent.

As used herein, the term “subject” refers to an animal. Typically the animal is a mammal. A subject also refers to for example, primates (e.g., humans, male or female), cows, sheep, goats, horses, dogs, cats, rabbits, rats, mice, fish, birds and the like. In certain embodiments, the subject is a primate. in yet other embodiments, the subject is a human.

As used herein, a subject is “in need of’ a treatment if such subject would benefit biologically, medically or in quality of life from such treatment.

The term "a therapeutically effective amount" of a nd of the present invention refers to an amount of the compound of the present invention that will elicit the biological or medical response of a subject, for example, reduction or inhibition of an enzyme or a protein activity, or ameliorate symptoms, alleviate conditions, slow or delay disease progression, or prevent a disease, etc. in one non-limiting embodiment, the term “a therapeutically effective amount” refers to the amount of the compound of the present invention that, when administered to a t, is effective to (1) at least partially alleviating, inhibiting, preventing and/or ameliorating a condition, or a disorder or a e (i) mediated by BACE—1 or (ii) associated with BACE-1 ty, or (iii) characterized by activity (normal or abnormal) of BACE-1; or (2) reducing or inhibiting the activity of BACE—1. In another non—limiting embodiment, the term “a therapeutically effective amount" refers to the amount of the compound of the present invention that, when PCT/132012/054269 administered to a cell, or a tissue, or a non-cellular biological material, or a medium, is effective to at least partially reduce or inhibit the activity of BACE-1. The meaning of the term “a therapeutically effective amount” as illustrated in the above embodiments for BACE-1 also applies by the same means to any other relevant proteins/peptides/enzymes, such as BACE-2, or cathepsin D.

As used herein, the term ”, “treating" or "treatment" of any disease or disorder refers in one embodiment, to rating the disease or disorder (i.e., slowing or arresting or reducing the development of the disease or at least one of the ciinical symptoms thereof). In r embodiment, “treat”, "treating" or "treatment" refers to modulating the disease or disorder, either physically, (e.g., stabilization of a discernible symptom), logically, (e.g., stabilization of a physical parameter), or both.

Detailed Description of the Invention The present invention provides compounds and pharmaceutical compositions thereof that may be useful in the treatment or prevention of diseases, conditions and/or disorders modulated by BACE inhibition.

Embodiment 1: a nd of formula (l), or a pharmaceutically acceptable salt thereof, as defined above in the first aspect of the invention.

Embodiment 2: a nd of a (I), or a pharmaceutically acceptable salt thereof, as defined above in the second aspect of the invention.

Embodiment 3: a compound of formula (l), or a pharmaceuticaily acceptable salt thereof, as defined above in the third aspect of the invention.

Embodiment 4: a compound according to any one of Embodiments 1 to 3, or a pharmaceutically acceptable salt thereof, wherein R1 and R2 are independently hydrogen or Embodiment 5: a compound ing to any one of Embodiments 1 to 4, or a ceutically acceptable salt thereof, wherein R1 and R2 are both fluoro.

PCT/132012/054269 Embodiment 6: a compound according to any one of Embodiments 1 to 5, or a ceutically acceptable salt thereof, wherein R3 and R4 are independently hydrogen or methyl.

Embodiment 7: a compound according to any one of Embodiments 1 to 6, or a pharmaceutically able salt thereof, wherein R3 and R4 are both hydrogen.

Embodiment 8: a compound according to any one of Embodiments 1 to 7, or a pharmaceutically acceptable salt thereof, wherein R5 is methyl, fluoromethyl, difluoromethyl, methoxymethyl, methoxyethyl, ethoxymethyl or ethoxyethyl. ment 9: a compound ing to any one of ments 1 to 8, or a pharmaceutically acceptable salt thereof, wherein R5 is methyl.

Embodiment 10: a compound according to any one of Embodiments 1 to 9, or a pharmaceutically acceptable salt thereof, n R6 is phenyl or a 5- or 6-membered monocyclic heteroaryl comprising 1, 2, 3 or 4 heteroatoms independently selected from N, O and S, and wherein said phenyl or heteroaryl is optionally substituted by 1, 2, 3 or 4 substituents independently selected from halogen, cyano, amino, hydroxy, CMalkyl, halogen-CMalkyl, halogen-CMalkylthio, n-CMalkoxy, CMalkoxy, C14alkoxy-C1_4alkyl, CMalkoxy—CMalkoxy and xy-Cmalkylthio.

Embodiment 11: a compound according to any one of Embodiments 1 to 9, or a pharmaceutically able salt thereof, wherein R6 is a 6-membered monocyclic heteroaryl comprising 1, 2, 3 or 4 heteroatoms independently selected from N, O and S, and wherein said phenyl or heteroaryl is optionally substituted by 1, 2, 3 or 4 substituents independently selected from halogen, cyano, amino, hydroxy, CMalkyl, halogen-C14alkyl, halogen-CMalkylthio, halogen-014alkoxy, xy, CMalkoxy-Cmalkyl, CMalkoxy—CMalkoxy and C14alkoxy-C1_ 4alkylthio.

Embodiment 12: a nd according to any one of Embodiments 1 to 9, or a pharmaceutically acceptable salt thereof, wherein R6 is a pyridyl or pyrazinyl group which is optionally substituted by 1, 2 or 3 substituents independently selected from halogen, cyano, amino, y, Cmalkyl, halogen-Cmalkyl, halogen-CMalkylthio, halogen-CMalkoxy, C1. 4alkoxy, oxy-C14alkyl, CMalkoxy-CMalkoxy and CMalkoxy-Cmalkylthio.

Embodiment 13: a compound ing to any one of Embodiments 1 to 9, or a pharmaceutically acceptable salt thereof, wherein R6 is a pyridyl or pyrazinyl group which is optionally substituted by 1, 2 or 3 tuents independently selected from halogen, cyano, amino, hydroxy, l, halogen-CMalkyl, halogen—CMalkylthio, halogen—C1_4alkoxy, C1- 4alkoxy, CMalkoxy-CMalkyl, CMalkoxy—Cmalkoxy, CMalkoxy-Cmalkylthio, CMalkoxy-Cg- 4alkenyl, C1_4a|koxy—Cz4alkynyl, hydroxy—CMalkyl, hydroxy-CMalkenyl and hydroxy-Cz-4alkynyl.

Embodiment 14: a compound according to any one of Embodiments 1 to 9, or a pharmaceutically acceptable salt thereof, n R6 is a pyridin—Z-yl group or a pyrazin-Z-yl group which is substituted by 2 substituents and wherein one of the substituents is located at the para position and one of the substituents is located at the ortho position of the pyridin-Z-yl or pyrazin-Z—yl group relative to the amide linker and wherein the substituents are independently selected from halogen, cyano, amino, hydroxy, CMalkyI, n-CMalkyl, halogen-CMalkylthio, halogen-CMalkoxy, CMalkoxy, xy-CMalkyl, C1-4alkoxy~CMalkoxy, CMalkoxy-C1_ 4alkylthio, C14alkoxy-024alkenyl, CMalkoxy-C2.4alkynyl, hydroxy—C1-4alkyl, hydroxy—Cyalkenyl and hydroxy—Cyalkynyl.

Embodiment 15: a nd according to any one of Embodiments 1 to 9, or a pharmaceutically acceptable salt thereof, wherein R6 is a pyridin—Z-yl group which is substituted by 2 substituents and wherein one of the tuents is located at the para position and one of the substituents is d at the ortho on of the pyridin-Z—yl group relative to the amide linker and wherein the substituents are independently selected from n, cyano, amino, hydroxy, C1-4alkyl, halogen—Cmalkyl, halogen—CMalkylthio, halogen-CMalkoxy, CMalkoxy, C1- 4alkoxy~C1_4alky|, CMalkoxy-Cmalkoxy and xy-CMalkylthio.

Embodiment 16: a compound according to any one of Embodiments 1 to 9, or a pharmaceutically acceptable salt thereof, wherein R6 is a pyridin-2~yl group which is substituted by 2 substituents and wherein one of the substituents is located at the para on and one of the substituents is located at the ortho position of the pyridin-Z—yl group relative to the amide linker and wherein the substituents are ndently selected from halogen, cyano, amino, hydroxy, methyl, trifluoromethyl, methoxy, trifluoromethoxy, 3-fluoro-propoxy, fluoromethoxy, 3- methoxy-propynyl, 2-methoxy—ethoxy and 3-hydroxy—propynyl.

Embodiment 17: a compound according to any one of Embodiments 1 to 9, or a pharmaceutically acceptable salt thereof, wherein R6 is a pyridin—2-yl group which is substituted by 2 substituents and wherein one of the substituents is located at the para position and one of PCT/IBZOIZ/054269 the tuents is located at the ortho on of the pyridinyl group relative to the amide linker and wherein the substituents are independently selected from n, cyano, amino, hydroxy, , trifluoromethyl, methoxy and trifluoromethoxy.

Embodiment 18: a compound according to any one of Embodiments 1 to 9, or a pharmaceutically acceptable salt thereof, wherein R6 is a pyrazin-Z-yl group which is substituted by 2 substituents and wherein one of the substituents is located at the para on and one of the substituents is located at the ortho position of the pyrazin—2—yl group relative to the amide linker and wherein the substituents are independently selected from halogen, cyano, amino, hydroxy, methyl, trifluoromethyl, methoxy, trifluoromethoxy, 3-fluoro-propoxy, fluoromethoxy, 3- methoxy—propynyl, oxy—ethoxy and 3-hydroxy—propynyl.

Embodiment 19: a compound according to any one of Embodiments 1 to 9, or a pharmaceutically acceptable salt thereof, wherein R6 is 5-cyanomethyl-pyridin-Z-yl.

Embodiment 20: a compound according to any one of Embodiments 1 to 9, or a pharmaceutically acceptable salt thereof, wherein R6 is rotrifluoromethyl-pyridin-Z—yl.

Embodiment 21: a compound according to Embodiment 3 of formula (la), or a pharmaceutically acceptable salt thereof, (Ia), wherein R1 and R2 are independently hydrogen or halogen; R3 and R4 are independently hydrogen or kyl; or R3 and R4 taken together are cyclopropyl; R5 is C1-3alkyl, halogen-C1_3a|kyl or C1_3a|koxy~C1.3alkyl; and R6 is phenyl or a 5- or 6-membered clic heteroaryl comprising 1, 2, 3 or 4 heteroatoms independently ed from N, O and S, and wherein said phenyl or heteroaryl is optionally substituted by 1, 2, 3 or 4 substituents independently selected from halogen, cyano, amino, hydroxy, C1.4alkyl, halogen-CMalkyl, halogen-CMalkylthio, halogen-CMalkoxy, Cualkoxy, C1- 4alkoxy-CMalkyl, CMalkoxy-Cmalkoxy and CMalkoxy—Cmalkylthio.

PCT/IBZOIZ/054269 Embodiment 22: a compound according to ment 3 of formula (lb), or a pharmaceutically acceptable salt thereof, wherein R3 and R4 are independently hydrogen or methyl; and R6 is a 6-membered monocyclic heteroaryl comprising 1, 2, 3 or 4 heteroatoms independently selected from N, O and S, and wherein said phenyl or heteroaryl is optionally substituted by 1, 2, 3 or 4 substituents independently ed halogen, cyano, amino, hydroxy, CMalkyl, halogen- CMalkyl, halogen-CMalkylthio, halogen-C1-4alkoxy, C1_4alkoxy, CMalkoxy-CMalkyl, CMalkoxy- CMalkoxy and CMalkoxy-Cmalkylthio.

Embodiment 23: a compound according to Embodiment 3 of formula (lc), or a ceutically acceptable salt thereof, wherein ii!8 is a pyridin-Z-yl group which is substituted by 2 substituents and wherein one of the tuents is located at the para on and one of the substituents is located at the ortho position of the pyridinyl group relative to the amide linker and n the substituents are independently selected from n, cyano, amino, hydroxy, methyl, trifluoromethyl, methoxy and trifluoromethoxy.

Embodiment 24: a compound according to Embodiment 3 of formula (lc), or a pharmaceutically acceptable salt thereof, wherein R6 is a pyraziny| group which is substituted by 2 tuents and wherein one of the substituents is d at the para position and one of the substituents is located at the ortho position of the pyrazin-Z—yl group relative to the amide linker and wherein the substituents are independently selected from halogen, cyano, amino, hydroxy, methyl, trifluoromethyl, methoxy and trifluoromethoxy.

Embodiment 25: a compound according to Embodiment 2, which is selected from: -Cyanomethyl-pyridine-2—carboxylic acid [6-(2—amino-5,5-difluoromethyl-5,6—dihydro-4H- [1,3] oxazin-4—yl)-5—fluoro—pyridin-Z-yl]-amide; 3-Chlorocyano-pyridine-Z-carboxylic acid [6-(2—amino-5,5-difluoro—4—methyl-5,6-dihydro—4H- [1,3] oxazin-4—yl)fluoro-pyridin-Z-yH-amide; 3-Chlorocyano-pyridinecarboxylic acid [6-(2-amino—5,5-difluoro-4,6,6-trimethyl-5,6-dihydro- 4H-[1,3] oxazinyl)~5-fluoro—pyridin—Z-ylj—amide; 5—Cyanomethyl-pyridinecarboxylic acid {6-[2—amino—5,5-difluoro-4—(2—methoxy—ethyl)—5,6— dihydro-4H-[1,3]oxazin-4—yl]—5-fluoro-pyridinyl}-amide; 3-Chlorotrifluoromethyl—pyridine-Z—carboxylic acid {6—[2—amine-5,5—difluoro-4—(2-methoxy— ethyl)—5,6-dihydro-4H—[1 ,3]oxazin-4—yl]fluoro—pyridin-Z—yl}-amide; rotrifluoromethyl-pyridine—Z-carboxylic acid amine-5,5-difluoro-4—methyl-5,6— dihydro-4H-[1,3]oxazinyl)-5—fluoro~pyridin—2—yl]-amide; otrifluoromethyl-pyrazine-2—carboxylic acid [6-(2—amino-5,5—difluoromethyl-5,6- dihydro-4H-[1,3]oxazinyl)—5—fluoro-pyridinyl}-amide; 3,5-Dichloro-pyridine-Z-carboxylic acid [6-(2-amino-5,5-difluoromethyl-5,6-dihydro-4H- [1 ,3]oxazin—4—yl)-5—fluoro—pyridinyl]-amide; 3-Amino—5-(2,2,2-trifluoro-ethoxy)pyrazine-Z-carboxyiic acid [6-(2-amino-5,5-difluoro—4-methyl- ,6—dihydro-4H-[1,3]oxazinyl)—5-fiuoro—pyridinyi1-amide; 3-Amino(2,2-difluoro—ethoxy)—pyrazine—Z-carboxyiic acid [6—(2-amino—5,5—difluoro-4—methyi-5,6- dihydro-4H—[1,3]oxazinyl)—5-fiuoro—pyridin-Z-yH-amide; 3-Amino(3—fluoro—propoxy)—pyrazine—2—carboxylic acid [6-(2-amino-5,5-difluoromethyl-5,6— dihydro—4H—[1,3]oxazin-4—y|)f|uoro-pyridin-2—yi]~amide; —Methoxy—3-methyI-pyridine—2-carboxyiic acid amino—5,5-difluoro—4—methyl-5,6-dihydro—4H- [1 ,3]oxazin—4-yI)—5-fluoro-pyridin-2—yii—amide; o—5—(3-methoxy—propynyi)—pyridine—2—carboxyiic acid [6—(2—amino-5,5-difluoro~4—methyi- 5,6—dihydro—4H-[1,3]oxazin-4—yl)—5-fiuoro-pyridin-2—yl]—amide; 3-Amino—S-fluoromethoxy—pyrazine—Z-carboxylic acid [6-(2-amino—5,5-difluoro—4—methyi-5,6- dihydro-4H-[1,3]oxazin-4—y|)f|uoro—pyridin—Z-yI]—amide; 3-Amino(2—methoxy-ethoxy)-pyrazinecarboxyiic acid [6-(2-amino-5,5-difluoro-4—methyi-5,6- dihydro-4H-[1 ,3]oxaziny|)fluoro-pyridin-Z-yli-amide; 3—Amino—5-(3-hydroxy-propynyi)—pyridine-Z-carboxyiic acid [6-(2—amino—5,5-difluoro—4-methyi- ,6-dihydro-4H—[1,3]oxazinyl)fluoro-pyridinyi]—amide; 3-Amino—5-fluoro-pyridine—2—carboxyiic acid [6-(2—amino-5,5—difiuoromethyl-5,6-dihydro-4H- [1 ,3]oxazinyI)fluoro~pyridin-2—yi]—amide; 3-Amino—5-chloro-pyridine-2—carboxyiic acid aminc-5,5-difluoro-4~methyl—5,6-dihydr0—4H- [1 ,3]oxazin-4—yI)—5-fluoro-pyridinyi1-amide; 3-Chlore-pyridine-Z-carboxyiic acid[6-(2-amino-5,5-difluoro~4~methyI-5,6-dihydro-4H-[i ,3]oxazin- 4~y|)—5—fluoro-pyridinyI]-amide; 3-Chloro(3-methoxy—prop—1-yny|)pyridine-Z-carboxylic acid {6—(2—aminc-5,5-difiuoromethyl- ,6—dihydro—4H-[1,3]oxazinyi)f|uoro—pyridin-Z-yii-amide; odifluoromethyl-pyrazine-Z-carboxylic acid [6-(2-amino-5,5-difluoromethyi-5,6— dihydr0-4H-[1 ,3]oxaziny|)fluoro-pyridinyi1-amide; 3-Amino—5-(2-chloro-ethoxy)—pyrazine—Z-carboxylic acid [6-(2-amino-5,5-difluoromethyl-5,6- dihydro-4H-[1 ,3]oxaziny|)fluoro-pyridinyI]-amide; 3-Chioro—5-(2,2—difluoro—ethoxy)—pyridine—2—carboxylic acid [6-(2-amino—5,5-difluor0—4—methyI—5,6— dihydro-4H-[1,3]oxazinyl)—5-fluoro—pyridinyl]—amide; 3-Amino(2—fluoro-ethoxy)—pyrazine—2-carboxylic acid [6-(2—amino—5,5-diflu0romethyI-5,6— dihydro-4H-[1,3]oxazin-4—yi)fiuoro—pyridinyii-amide; S-Chioro—5-fluoromethoxy—pyridine—2-carboxyiic acid [6-(2-amino—5,5-difiuoro—4-methyI-5,6- o-4H-[1,3]oxazin-4—yi)f|uoro—pyridin-Z-yi]—amide; 3-Chioroethoxy—pyridine—2-carboxylic acid [6-(2-amino—5,5-difluoro—4-methyi-5,6-dihydro-4H- [1,3]0xazin-4—yl)fluoro-pyridinyi]-amide; 3-Amino—5-(penta-deutero-ethoxy)—pyrazine—Z-carbcxylic acid {6-(2-amino—5,5-difluoromethyi- ,6—dihydr0-4H-[1,3]oxaziny|)f|uoro-pyridin-Z-yi]-amide; o(2-methoxy-ethyl)-pyrazinecarboxylic acid [6-(2-amino-5,5-difluoromethyI-5,6- dihydro-4H-[1,3]oxaziny|)f|uoro-pyridin-2—yi]-amide; 4-Chloro—1-difluoromethyl-1H-pyrazole—3-carboxylic acid [6-(2-amino—5,5—diflu0ro—4—methyI-5,6- dihydro—4H—[1,3]oxazin-4—y|)f|uoro—pyridinyi]-amide; 3-Amino—pyrazine—Z-carboxylic acid [6-(2—amino—5,5-difluoro—4—methyI-5,6-dihydro—4H- [1 ,3]oxazin-4—yl)fluoro—pyridinyi]—amide; 3-ChIoro(3-hydroxy-prop—1-ynyi)-pyridine~2-carboxylic acid [6-(2-amino—5,5-difluoro—4-methyl- 5,6~dihydro—4H-[1,3]oxazinyl)fluoro-pyridin-Z-yi]—amide; 3-Amino—S-difiuoromethyl—pyridinecarboxyiic acid [6-(2—amin0-5,5—difluoro—4-methyi-5,6— dihydro—4H-[1,3]oxaziny|)fluoro-pyridin—2—yl]—amide; 3-Aminochioro(i ,1—difluoro-ethyl)—pyrazine—2-carboxyiic acid [6—(2-amino-5,5-difluoro-4— methyl-5,6-dihydro—4H-[1,3]oxaziny|)fluoro-pyridinyi]—amide; 5-Cyano—pyridine—Z-carboxylic acid amino-5,5-difluoromethyl-5,6—dihydro-4H-[1,3]oxazin- 4-yl)fluoro-pyridinyl]—amide; 3-Chloro(1,1-difluoro-ethyl)-pyridine-Z-carboxylic acid amino-5,5-difluoromethyl-5,6— dihydro-4H-[1,3]oxazinyl)fluoro-pyridinyl]-amide; and 3-Amino(1,1—difluoro-ethyl)-pyrazinecarboxylic acid [6-(2—amino—5,5-difluoro-4—methyI-5,6— dihydro—4H—[1,3]oxazin-4—yl)f|uoro—pyridin-Z—yll-amide; and pharmaceutically acceptable salts thereof.

Embodiment 26: a compound according to Embodiment 2, which is ed from: -Cyano-3~methyl-pyridinecarboxylic acid )—2—amino-5,5-difluoromethyl—5,6—dihydro- 4H—[1,3] oxazinyl)fluoro-pyridinyl]-amide; 3-Chlorocyano-pyridinecarboxyllc acid [6-((R)—2—amino-5,5-difluoromethyl-5,6—dihydro- 4H—[1,3] oxazin-4—yl)fluoro-pyridin-Z-yll-amide; 3—Chlorocyano-pyridinecarboxylic acid [6-((R)—2—amino—5,5-difluoro-4,6,6-trimethyl-5,6- dihydro-4H-[1,3] oxazin-4—yl)-5—fluoro-pyridin—Z-yH-amide; -CyanomethyI-pyridinecarboxylic acid {6-[(R)—2—amino-5,5-difluoro(2-methoxy-ethyl)- ,6-dihydro-4H-[1,3]oxazinyl]—_5-fluoro-pyridinyl}-amide; 3~Chloro-5—trifluoromethyl—pyridinecarboxylic acid {6—[(R)—2-amino-5,5—difluoro—4—(2-methoxy— ethyl)—5,6-dihydro-4H-[1 zinyl}—5—fluoro—pyridin-Z-yl}-amide; 3-ChIorotrifluor0methyl—pyridine-2—carboxylic acid [6~((R)—2-amino-5,5-difluoro—4-methyl—5,6— dihydro-4H-[1,3]oxazin-4—yl)—5-f|uoro-pyridin-Z-yl]—amide; o—5-trifluoromethyl-pyrazinecarboxylic acid [6-((R)—2-amino-5,5-difluoro-4—methyl-5,6— dihydro-4H—[1,3]oxazin-4—yl)—5—fluoro—pyridinyl]~amide; 3,5-Dichloro-pyridine~2~carboxylic acid [6-((R)—2-amino-5,5-difluoro~4-methyl—5,6—dihydro-4H- [‘l ,3}oxazin—4—yl)fluoro-pyridinyl]—amide; 3-Amino(2,2,2—trifluoro-ethoxy)pyrazinecarboxylic acid [6-((R)amino-5,5-difluoro-4— methyl-5,6-dihydro-4H-[1,3]oxazinyl)-5~fluoro-pyridin-Z—yll-amide; 3-Amino(2,2-difluoro-ethoxy)—pyrazine-Z-carboxylic acid [6-((R)amino-5,5-difluoromethyl- ,6—dihydro-4H-[1,3]oxazinyl)—5-fluoro—pyridinyl]—amide; 3-Amino(3-fluoro-propoxy)—pyrazinecarboxylic acid [6-((R)amino-5,5-difluoromethyl- ,6-dihydro-4H-[1,3]oxazin~4—yI)fluoro-pyridinyl]-amide; -Methoxy—3—methyI-pyridine-2—carboxylic acid [6—((R)amino-5,5-difluoromethyi—5,6-dihydro— 4H-[1,3]oxazinyi)f|uoro-pyridin—Z-yi]~amide; 3-Amino(3-methoxy—propynyl)-pyridine~2~carboxylic acid {6—((R)-2—amino—5,5-difluoro—4— methyl-5,6—dihydro—4H-[1,3]oxazinyi)-5~fluoro—pyridin—2-yii—amide; 3-Aminofluoromethoxy-pyrazine—2—carboxyiic acid {ES—((R)—2—amino-5,5-difluoro—4-methyi—5,6- dihydro-4H-[1,3]oxazin—4-yi)—5-fluoro-pyridin~2~y|]-amide; 3-Amino-5—(2—methoxy—ethoxy)-pyrazinecarboxyiic acid [6-((R)—2—amino—5,5—difluoromethyl~ 5,6—dihydro—4H-[1,3]oxazinyi)fiuoro~pyridinyi]-amide; 3-Amino(3-hydroxy-propynyi)-pyridine-Z-carboxylic acid )—2-amin0-5,5-difluoro—4- methyl-5,6—dihydro-4H-[1,3]oxazinyl)—5-f|uoro-pyridin—2—yi]—amide; ofluoro-pyridine—Z-carboxylic acid )—2—amin0-5,5-difluoromethyI-5,6—dihydro— 4H-[1,3]oxazinyI)f|uoro-pyridin-Z-yi]-amide; 3-Amino—5—chloro—pyridine-Z-carboxylic acid [6-((R)—2~amino—5,5-difluoromethyI-5,6-dihydro- 4H-[1,3]oxazin-4—y|)—5-fluoro—pyridinyi]-amide; 3—Chloro-pyridine-2—carboxylic —((R)—2-amino-5,5-difluoro-4—methyi—5,6—dihydro—4H- [1 ,3]oxazin-4—yl)fluoro—pyridin—2-yl]—amide; 3-Chi0ro—5—(3-methoxy-prop~1-ynyi)pyridine-Z—carboxylic acid [6-((R)amino-5,5—difluor0—4~ methyl-5,6—dihydr0—4H-[1,3]oxazin-4—yi)—5—f|uoro-pyridinyi]~amide; 3-Amino-5—difluoromethyl-pyrazine—Z—carboxyiic acid [6-((R)amino—5,5-difluoro-4—methyI-5,6- dihydro—4H-[1,3]oxaziny|)-5—f|uoro-pyridinyi1-amide; 3-Amino(2-chloro-ethoxy)—pyrazine-Z-carboxyiic acid [6—((R)—2—amino-5,5-difluoromethyi— ,6—dihydro—4H-[1,3]oxazin-4—y|)fluoro-pyridin-Z—yU-amide; 3-Chloro(2,2-difluoro-ethoxy)-pyridine—2—carboxyiic acid [6-((R)-2—amino-5,5-difluoromethy|— ,6-dihydro-4H-[1,3]0xazin-4—yi)fiuoro-pyridinyl]-amide; PCT/IBZOIZ/054269 3-Amino(2-fluoro-ethoxy)-pyrazinecarboxyiic acid [6-((R)—2-amino-5,5-difluoromethy|- ,6-dihydro-4H-[1,3]oxaziny|)f|uoro-pyridinyI]-amide; ro-5—fluoromethoxy-pyridine-Z-carboxylic acid [6-((R)amino-5,5—difluoro—4-methyl-5,6— dihydro—4H-[1,3]oxazin-4—yl)—5—fluoro-pyridinyli-amide; 3-Chioro-S-ethoxy-pyridine-Z-carboxylic acid [6-((R)aminc-5,5—difluoro-4—methyl—5,6-dihydro— 3]oxazin-4—yI)—5-fluoro-pyridinyi]-amide; 3-Amino(penta-deutero-ethoxy)—pyrazine—Z-carboxylic acid [6-((R)—2-amino-5,5—difluoro methyl-5,6—dihydro—4H-[1,3]oxazinyi)fluoro-pyridin-2—yi]—amide; 3-Amino—5-(2—methoxy-ethyi)-pyrazine—2-carboxyiic acid [6-((R)-2~amino-5,5-difluoro—4—methyi- hydro-4H-[1,3]oxazin—4-yl)-5—fluoro-pyridin-Z-yn-amide; 4-Chlorodifluoromethyi-1H-pyrazole-B-carboxyiic acid [6-((R)~2~amino—5,5-difluoro—4—methyl- ,6-dihydr0-4H-[1,3]oxazinyl)fluoro-pyridin-Z—yl]—amide; 3-Amino-pyrazine-Z-carboxylic acid [6-((R)-2—amino—5,5-difluoromethyl-5,6-dihydro-4H- [1 ,3]oxazinyl)fluoro-pyridin-2—yi]-amide; 3-Chlor0(3-hydroxy—propyny|)-pyridine—2—carboxyiic acid [6—((R)—2—amino—5,5-dif|uoro methyl-5,6—dihydro-4H-[1,3]0xazin-4—yl)f|uoro—pyridinyI]-amide; 3-Amino-S-difluoromethyi-pyridine-Z-carboxylic acid [6-((R)—2-amino~5,5—difluoro-4—methyi-5,6- dihydro-4H-[1,3]oxazin-4—yi)—5—fluoro—pyridin—2—yl]—amide; 3-Amino-6~ch|oro—5—(1,1-difluoro—ethyi)~pyrazinecarboxylic acid [6-((R)—2—amino-5,5—difluoro—4- methyl-5,6—dihydro-4H—[1,3]oxazin—4-yi)fluoro-pyridinyi]-amide; ~Cyano-pyridine-Z-carboxylic acid [6-((R)—2-amino—5,5—difluoro—4-methyI-5,6-dihydro-4H- [1 ,3]oxazinyI)fluoro-pyridin-2—yl}-amide; 3-Chlor0(1,1-diflu0ro—ethyl)—pyridinecarboxylic acid [6-((R)—2-amino-5,5-difluoromethyl- ,6—dihydro-4H-[1,3]oxaziny|)f|uoro-pyridin-Z-yi]-amide; and 3-Amino(1,1-difluoro—ethy|)-pyrazine-Z-carboxylic acid [6-((R)amino-5,5-dif|uoromethyl- ,6—dihydro-4H-[1,3]oxazin—4~yl)f|uoro-pyridin-Z—yl]—amide; and ceutically acceptable salts thereof.

On t of one or more than one trical carbon atom, which may be present in a compound of the a (I), a corresponding compound of the formula (I) may exist in pure lly active form or in the form of a mixture of optical isomers, e. g. in the form of a racemic mixture. All of such pure optical s and all of their mixtures, including the racemic mixtures, are part of the present invention unless the context es otherwise (for e in an embodiment of the invention clearly ying a single enantiomer).

As used herein, the term “isomers” refers to different nds that have the same molecular formula but differ in arrangement and configuration of the atoms. Also as used herein, the term “an optical isomer" or ”a stereoisomer” refers to any of the various stereo isomeric configurations which may exist for a given compound of the present invention and includes geometric isomers. it is understood that a substituent may be attached at a chiral center of a carbon atom. The term "chiral" refers to molecules which have the property of non-superimposabiiity on their mirror image partner, while the term "achiral" refers to molecules which are superimposable on their mirror image r. Therefore, unless the t dictates otherwise (for example in an embodiment of the ion clearly specifying a single enantiomer) the invention includes enantiomers, diastereomers or racemates of the compound. “Enantiomers” are a pair of stereoisomers that are non- superimposable mirror images of each other. A 1:1 mixture of a pair of enantiomers is a "racemic” mixture. The term is used to ate a racemic mixture where appropriate. "Diastereoisomers" are stereoisomers that have at least two tric atoms, but which are not mirror-images of each other. The absolute stereochemistry is specified ing to the Cahn— lngold- Prelog R—S system. When a compound is a pure enantiomer the stereochemistry at each chiral carbon may be specified by either R or 8. Resolved compounds whose absolute configuration is unknown can be designated (+) or (-) depending on the direction (dextro- or ievorotatory) which they rotate plane polarized light at the wavelength of the sodium D line. Certain compounds described herein contain one or more asymmetric centers or axes and may thus give rise to enantiomers, diastereomers, and other stereoisomeric forms that may be defined, in terms of absolute stereochemistry, as (R)- or (S)-.

Depending on the choice of the starting materials and procedures, the compounds can be present in the form of one of the possible isomers or as mixtures thereof, for example as pure optical isomers, or as isomer mixtures, such as racemates and diastereoisomer mixtures, depending on the number of asymmetric carbon atoms. The present invention is meant to include all such possible s, including racemic mixtures, diasteriomeric mixtures and optically pure forms. Optically active (R)— and (S)— isomers may be prepared using chiral W0 20131027188 PCT/IBZOIZ/054269 synthons or chiral reagents, or resolved using conventional techniques. If the compound contains a double bond, the substituent may be E or Z configuration. If the compound contains a disubstituted cycioalkyl, the lkyl substituent may have a cis— or trans-configuration.

In one embodiment of the ion, there is provided a compound of the Examples having one Chiral center as an isolated stereoisomer in the R configuration. in one ment of the invention, there is provided a compound of the Examples having one Chiral center as an isolated stereoisomer in the S uration.

In one embodiment of the invention, there is provided a compound of the Examples having one chiral center as a racemic mixture. it is also le that the intermediates and compounds of the present invention may exist in different tautomeric forms, and all such forms are embraced within the scope of the invention.

The term "tautomer" or "tautomeric form" refers to ural s of ent energies which are interconvertible via a low energy barrier. For example, proton tautomers (also known as prototropic tautomers) include interconversions via migration of a proton, such as keto-enol and imine-enamine isomerizations. A specific example of a proton tautomer is the imidazole moiety where the proton may migrate between the two ring nitrogens. Valence tautomers include interconversions by reorganization of some of the bonding electrons.

Any resulting mixtures of isomers can be separated on the basis of the physicochemical differences of the constituents, into the pure or substantially pure geometric or l isomers, diastereomers, racemates, for example, by chromatography and/or fractional crystallization.

Any resulting racemates of final products or intermediates can be resolved into the optical antipodes by known methods, e.g., by separation of the diastereomeric salts thereof, obtained with an optically active acid or base, and liberating the optically active acidic or basic compound. in particular, a basic moiety may thus be employed to e the compounds of the present invention into their optical antipodes, e.g., by onal crystallization of a salt formed with an optically active acid, e.g., tartaric acid, oyl ic acid, diacetyl tartaric acid, di-0,0'—p— toluoyl ic acid, mandelic acid, malic acid or camphor-iO—sulfonic acid. Racemic products can also be resolved by chiral chromatography, e.g., high pressure liquid chromatography (H PLC) using a chiral adsorbent.

PCT/IBZOIZ/054269 As used herein, the terms “salt” or “salts” refers to an acid addition salt of a compound of the invention. “Salts” include in particular “pharmaceutical acceptable salts”. The term “pharmaceutically acceptable salts" refers to salts that retain the biological iveness and properties of the compounds of this invention and, which typically are not biologically or otherwise rable. The compounds of the present invention may be capable of forming acid salts by virtue of the presence of amino groups or groups similar thereto.

In one embodiment, the invention relates to a compound of the formula (I), (la), (lb) or (Ic) as defined , in free form. In another embodiment, the invention relates to a compound of the formula (I), (la), (lb) or (Ic) as defined herein, in salt form. In another embodiment, the invention relates to a compound of the formula (l), (Ia), (lb) or ([0) as defined herein, in acid addition salt form. In a further embodiment, the invention relates to a compound of the formula (I), (la), (lb) or (Ic) as defined herein, in pharmaceutically acceptable salt form. In yet a further embodiment, the invention relates to a compound of the formula (l), (Ia), (lb) or (Ic) as defined herein, in ceutically acceptable acid addition salt form. In yet a further embodiment, the invention relates to a compound of the formula (I), (la), (lb) or (Ic) as defined , in hydrochloride salt form. In yet a further embodiment, the invention relates to any one of the compounds of the Examples in free form. In yet a further embodiment, the invention relates to any one of the compounds of the es in salt form. In yet a further embodiment, the invention relates to any one of the nds of the Examples in acid on salt form. In yet a further embodiment, the invention relates to any one of the compounds of the es in pharmaceutically acceptable salt form. In still another embodiment, the invention relates to any one of the compounds of the es in pharmaceutically acceptable acid addition salt form. In still another embodiment, the invention s to any one of the compounds of the Examples in hydrochloride salt form.

Pharmaceutically acceptable acid addition salts can be formed with inorganic acids and organic acids, e.g., acetate, aspartate, te, te, bromide/hydrobromide, bicarbonate/carbonate, ate/sulfate, camphorsulfonate, chloride/hydrochloride, chlortheophyllonate, e, ethandisulfonate, fumarate, gluceptate, gluconate, glucuronate, hippurate, hydroiodide/iodide, isethionate, lactate, Iactobionate, Iaurylsulfate, malate, maleate, malonate, mandelate, mesylate, methylsulphate, naphthoate, napsylate, nicotinate, nitrate, octadecanoate, oleate, oxalate, palmitate, pamoate, phosphate/hydrogen phosphate/dihydrogen phosphate, polygalacturonate, propionate, te, succinate, sulfosalicylate, tartrate, tOSylate and trifluoroacetate salts.

PCT/IBZOIZ/054269 nic acids from which salts can be derived include, for e, hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like.

Organic acids from which salts can be derived include, for example, acetic acid, propionic acid, glycolic acid, oxalic acid, maleic acid, malonic acid, succinic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, mandelic acid, esulfonic acid, ethanesulfonic acid, toluenesulfonic acid, sulfosalicylic acid, and the like. Pharmaceutically acceptable base addition salts can be formed with inorganic and organic bases.

The pharmaceutically acceptable salts of the present invention can be synthesized from an acidic moiety, by tional chemical s. Generally, such salts can be prepared by reacting free base forms of these compounds with a stoichiometric amount of the appropriate acid. Such reactions are typically carried out in water or in an organic solvent, or in a mixture of the two. Generally, use of non-aqueous media like ether, ethyl acetate, ethanol, panol, or acetonitrile is desirable, where practicable. Lists of additional suitable salts can be found, e.g., in “Remington's Pharmaceutical Sciences”, 20th ed., Mack Publishing Company, Easton, Pa., (1985); and in “Handbook of ceutical Salts: Properties, Selection, and Use” by Stahl and Wermuth (Wiley-VCH, Weinheim, Germany, 2002).

Furthermore, the compounds of the present ion, including their salts, may also be obtained in the form of their hydrates, or include other ts used for their crystallization. The compounds of the present invention may inherently or by design form solvates with pharmaceutically acceptable ts (including water); therefore, it is intended that the invention embrace both solvated and unsolvated forms. The term "solvate" refers to a lar complex of a compound of the present invention (including pharmaceutically acceptable salts thereof) with one or more solvent molecules. Such solvent molecules are those commonly used in the pharmaceutical art, which are known to be innocuous to the recipient, e.g., water, ethanol, and the like. The term ”hydrate" refers to the complex where the solvent molecule is water.

Compounds of the ion, i.e. compounds of formula (i) that contain groups capable of acting as donors and/or acceptors for hydrogen bonds may be capable of forming co-crystals with suitable co-crystal formers. These co-crystals may be prepared from compounds of formula (l) by known co-crystal forming procedures. Such procedures include grinding, heating, co- subliming, co-melting, or ting in on compounds of formula (I) with the co-crystal former under crystallization conditions and isolating stals thereby formed. Suitable co- PCT/[82012/054269 l formers include those described in WO 78163. Hence the invention further provides co-crystals comprising a compound of formula (l).

The compounds of the present invention, including salts, hydrates and solvates thereof, may inherently or by design form polymorphs.

Any formula given herein is also intended to represent unlabeled forms as well as isotopically labeled forms of the compounds. lsotopically labeled compounds have structures depicted by the formulas given herein except that one or more atoms are replaced by an atom having a selected atomic mass or mass . Examples of isotopes that can be incorporated into compounds of the invention include isotopes of hydrogen, carbon, en, oxygen, phosphorous, fluorine, and chlorine, such as 2H, 3H, 11C, 13C, 14C, 15N, 18F 31P, 32P, 358, 36Cl, 125l respectively. The invention includes various isotopically labeled compounds as defined herein, for example those into which radioactive isotopes, such as 3H and 14C, or those into which non- radioactive isotopes, such as 2H and 13C are present. Such isotopically labelled compounds are useful in metabolic studies (with 14C), reaction c studies (with, for example 2H or 3H), detection or imaging techniques, such as positron emission tomography (PET) or single-photon on computed tomography (SPECT) including drug or substrate tissue distribution assays, or in radioactive treatment of patients. in particular, an 18F or labeled nd may be particularly ble for PET or SPECT studies. isotopically-labeled compounds of formula (I) can generally be prepared by conventional techniques known to those skilled in the art or by processes analogous to those described in the accompanying Examples and ations using an riate isotopically-labeled reagents in place of the beled reagent usly Further, substitution with heavier isotopes, particularly deuterium (i.e., 2H or D) may afford certain eutic advantages resulting from greater metabolic stability, for example increased in vivo half-life or reduced dosage requirements or an improvement in therapeutic index. It is understood that deuterium in this context is regarded as a substituent of a compound of the formula (1). The concentration of such a heavier isotope, specifically deuterium, may be defined by the isotopic enrichment factor. The term pic enrichment factor" as used herein means the ratio between the isotopic abundance and the natural abundance of a specified isotope. If a substituent in a nd of this invention is denoted deuterium, such nd has an isotopic enrichment factor for each designated deuterium atom of at least 3500 (52.5% deuterium incorporation at each designated deuterium atom), at least 4000 (60% deuterium incorporation), at least 4500 (67.5% deuterium incorporation), at least 5000 (75% deuterium incorporation), at least 5500 (82.5% deuterium oration), at least 6000 (90% deuterium incorporation), at least 6333.3 (95% deuterium incorporation), at least 6466.7 (97% deuterium incorporation), at least 6600 (99% deuterium incorporation), or at least 6633.3 (99.5% deuterium incorporation).

Pharmaceutically acceptable solvates in accordance with the invention include those wherein the t of crystallization may be isotopically tuted, e.g. D20, tone, de—DMSO.

Compounds of the present invention may be synthesized by synthetic routes that include processes analogous to those well-known in the chemical arts, particularly in light of the description contained herein. The starting als are generally available from commercial sources such as Sigma—Aldrich or are readily prepared using methods well known to those skilled in the art (e.g., prepared by methods generally described in Louis F. Fieser and Mary Fieser, Reagents for Organic sis, v. 1-19, Wiley, New York (1967-1999 ed.), or Beilsteins Handbuch der organischen Chemie, 4, Aufl. ed. Springer-Verlag, , including supplements (also available via the Beilstein online database».

For illustrative purposes, reaction schemes 1 and 2 depicted below e potential routes for synthesizing the compounds of the present invention as well as key intermediates. For a more detailed description of the individual on steps, see the Examples section below. Those skilled in the art will appreciate that other synthetic routes may be used to synthesize the inventive nds. gh specific starting materials and reagents are depicted in the schemes and discussed below, other starting materials and reagents can be easily substituted to provide a variety of derivatives and/or reaction conditions. In addition, many of the compounds prepared by the methods bed below can be further modified in light of this disclosure using conventional chemistry well known to those skilled in the art.

Scheme 1 o 0 Br N Br N DIPEA Br N 3" N\ \ 5 1) LDA 1) LDA \ \ TMS-triflate R / / / 2) EtasiCl / F 2)DMA dimethoxy- F F F methane V1 VSi\/ VSIQ/ 1)LDA 2) electrophile S\ o/\ >r ””2 F o/\ F o F . . o Rug”1 R or S -tert.but( ) l-sulflnamlde F 0 KF,AcOH 0 LIBH4. 4 Br N g \\\\\‘ N/ ”ll/K ____, II —_’ ___> o l 5 H Br N \\ R \\ /S.,I,K or 2)Zn F \‘ Rsfi F / MeMgBr O F Br K F \/KSi (Reformatsky reagent) OH 3 OH F F 4 3 F R F R 0 4 // R Br Br N N E 1) 4M ch, Br N \\\\ N/ l”/ ‘ ——’ —> \ \\“ NH R5 H [2) CSA] R5 2 NaHC03 3 4 FR3 R R F F R3 R4 F Cu O O introduction F O NH2 PG group F 3 HZN N \\ / 0 ———* Br N \ \“ \ / N NH \ \“‘ N NH [ R5 H N N v / PG 2 2 / \ \“ R / N N F I R H F N ”3 wk 0 PG group N\ \\\‘\ N/ /PG 1 R5 H PG = Protecting Group / e.g. DMTr or Boc F R'KerHz 4 Pd or I ' FR3 R ca a ysus 6 F F R\[r0H F 0 H AN/PG —> YTFA R6 [NI N A ’ R6 N N\ \\\\\ N \\\\\ 5 NHz N l R EDC, HOAt Y I R5 H o / O / F Scheme 2 Br N O .

O NEt3 0 0 o Vsl\/ / phenyl- K (13' isocynate WM”20 DAST LDA, THF N\ 0 0 —> - or o \NO/ (or \ / \ / R 2) DAST Bl/fioom0/\ 0/ rac. rac.

N\ \\‘ 08 0 CU20 O . B!” N / KF,AcOH N/ chiralsep. \\\\\ Br N\ \ NH3 \\ 5 fl —"' ~—-——-—> R R5 H (or crystallization / with chiral acid at F \/S'\/ F lcohol stage) rac. 0 0 p91 H2 or PG‘ OH introduction O Hill /0 ammonium Hill ”2” N / p61 group formmte, Pd-C w N\ “9 N N\ \\\\‘ \\\ N —> —--——> NH I I R5 H 5 2 R5 H alcohol | R / / / F F PG = protecting group O o / N PG1 // introduction P61 removal Br I 2 I HN PG group PG‘ ‘ HN > N\\\\\‘ N\‘0‘ -—————-——> base | l / / p32 F F 0 RYOH removal P62 0 H N N 0 H 2 / \ \\\\\ N —> R6 NH —> N N ‘ / I \“ Rs \\ N EDC,HOAt R5 / 11:62 \U/ l F 0 / PCT/IBZOIZ/054269 In a further aspect, the invention relates to a process for the preparation of a compound of the formula (I), in free form or in pharmaceutically acceptable salt form, comprising a) the reaction of a compound of the a (II), in free form or in salt form, in which R‘, R2, R3, R4 and R5 are as defined for the formula I and PG is a protecting group, for example N-tert—butoxycarbonyl, with a compound of the formula R\H/“ (HI), in free form or in salt form, in which R8 is as defined for the formula I and L is a leaving group, for example a hydroxyl group, b) the on of a compound of the formula (”8), in free form or in salt form, in which R1, R2, R3, R4 and R5 are as defined for the formula I, Hal is n, for example bromine, and PG is a protecting group, for e N—tert-butoxycarbonyl, with a compound of the formula R\n/NH2 (Illa), in free form or in salt form, in which R6 is as defined for the formula I, PCT/IBZOlZ/054269 c) the optional ion, oxidation or other functionalisation of the ing compound, d) the cleavage of any protecting group(s) optionally present and e) the recovery of the so obtainable compound of the formula I in free form or in salt form.

The above reactions can be effected according to conventional methods. For example, the reaction described in step (a) may be carried out in the presence of a suitable ng agent, for example oxy-7—azabenzotriazole, a le activating agent, for example 1-(3— dimethylaminopropyl)-3—ethylcarbodiimide hloride, and optionally a suitable base, for example diisopropylethylamine, a suitable solvent, for e dimethylformamide, and at a suitable temperature, for example 0 to 50°C, more suitably 0 to 25°C.

The reaction described in step (b) may be carried out: (i) in the presence of a suitable catalyst, for example tris(dibenzylidene-acetone) di palladium, a suitable ligand, for example Xantphos, a suitable base, for example cesium carbonate, a suitable solvent, for example dioxane, and at a suitable temperature, for e 10 to 100°C, more suitably 30 to 85°C; or (ii) in the presence of a suitable st, for example copper iodide, a suitable ligand, for example rac—trans—N,N’-dimethylcyclohexane-1,2-diamine, a suitable base, for example potassium carbonate, 8 suitable solvent, for example dioxane, and at a suitable temperature, for example reflux temperature.

The starting materials of the formulae II, He, Ill and Illa are known or may be prepared ing to conventional ures starting from known compounds, may be ed from known compounds as described in the Examples, or may be prepared using ures analogous to those described in the Examples.

The further optional reduction, oxidation or other functionalisation of compounds of formula (I) may be carried out according to methods well know to those skilled in the art.

Within the scope of this text, only a readily ble group that is not a constituent of the particular desired end product of the compounds of the present invention is designated a "protecting group", unless the t indicates otherwise. The protection of functional groups by such protecting groups, the protecting groups themselves, and their cleavage reactions are described for example in standard reference works, such as J. F. W. McOmie, "Protective Groups in Organic Chemistry", Plenum Press, London and New York 1973, in T. W. Greene and P. G. M. Wuts, "Protective Groups in Organic Synthesis", Third edition, Wiley, New York 1999, in "The Peptides"; Volume 3 (editors: E. Gross and J. Meienhofer), Academic Press, London and New York 1981, in "Methoden der organischen Chemie" ds of Organic Chemistry), Houben Weyl, 4th edition, Volume 15/I, Georg Thieme Verlag, Stuttgart 1974, and in H.-D.

Jakubke and H. Jeschkeit, "Aminosauren, Peptide, Proteine" (Amino acids, Peptides, Proteins), Verlag Chemie, Weinheim, Deerfield Beach, and Basel 1982. A characteristic of protecting groups is that they can be d readily (i.e. without the occurrence of undesired secondary reactions) for example by solvolysis, reduction, photolysis or alternatively under physiological conditions (e.g. by enzymatic cleavage).

Salts of compounds of the present invention having at least one salt-forming group may be prepared in a manner known to those skilled in the art. For example, acid addition salts of compounds of the present invention are obtained in ary manner, e.g. by treating the compounds with an acid or a suitable anion exchange reagent.

Salts can be converted into the free nds in accordance with s known to those skilled in the art. Acid addition salts can be converted, for example, by treatment with a le basic agent.

For those compounds ning an asymmetric carbon atom, the compounds exist in dual lly active isomeric forms or as mixtures thereof, e.g. as racemic or diastereomeric mixtures. Diastereomeric mixtures can be separated into their dual diastereoisomers on the basis of their physical chemical differences by methods well known to those skilled in the art, such as by tography and/or fractional crystallization. Enantiomers can be separated by converting the enantiomeric mixture into a diastereomeric mixture by reaction with an appropriate optically active compound (e.g., chiral auxiliary such as a chiral alcohol or Mosher‘s acid chloride), separating the diastereoisomers and converting (e.g., hydrolyzing) the individual diastereoisomers to the corresponding pure enantiomers. omers can also be separated by use of a commercially ble chiral HPLC column.

The invention further includes any variant of the present processes, in which the reaction components are used in the form of their salts or optically pure material. Compounds of the invention and intermediates can also be converted into each other ing to methods generally known to those skilled in the art.

PCT/IBZOIZ/054269 Compounds of the formula (I), in free form or in pharmaceutically acceptable salt form, herein- after often referred to as “agents of the invention”, exhibit valuable pharmacological ties, when tested in vitro, and may, therefore, be useful in medicaments, in therapy or for use as research chemicals, for example as tool compounds.

For example, agents of the invention are tors of BACE-1 and BACE—2 and may be used for the treatment or prevention of a condition, disease or disorder involving sing by such enzymes, particularly the generation of beta-amyloid and the subsequent aggregation into oligomers and fibrils, and loss of B cell mass and/or function.

The inhibiting properties of an agent of the invention towards proteases can be evaluated in the tests as described hereinafter.

Test 1: Inhibition of human BACE-1 Recombinant BACE-1 (extracellular domain, expressed in baculovirus and purified using stan- dard methods) at 0.1 to 1 nM concentrations is ted with the test compound at various concentrations for 1 hour at room temperature in 100 mM acetate buffer, pH 4.5, containing 0.1 % CHAPS. Activity was measured using a final tration of 3 pM of the fluorescence- quenched substrate Q-C(H803)-|Ie-Asp-Leu-Ala-VaI-Leu—Asp—HN—CHz-CHg-Mca, where Q = 2- nitro—5-amino benzoic acid and Mca = 7-methoxycoumarinyl acetic acid. Catalytic er was monitored in a Spectramax Gemini fluorescence plate reader (Molecular Devices) in black l microplates using excitation/emission wavelength of 325 nm and 400 nm, respectively.

Fluorescence increase was followed for 15 min, in 1 minute’s intervals. The fluorescence/time slopes were ated from duplicate wells and from wells without inhibitor and the leo values were calculated using a logistic meter model.

Test 2: Inhibition of human BACE-2 Recombinant BACE-2 (extracellular domain, sed in baculovirus and purified using stan- dard methods) at 0.1 to 1 nM concentrations is incubated with the test compound at various concentrations for 1 hour at room temperature in 100 mM acetate buffer, pH 4.5, ning 0.1 % CHAPS. ty was measured using a final concentration of 3 uM of the fluorescence- quenched substrate Q-C(HSOs)-lie-Asp-Leu-AIa-Val-Leu-Asp-HN-CHg-CHz-Mca, where Q = 2- nitroamino benzoic acid and Mca = 7-methoxycoumarinyl acetic acid. Catalytic turnover was monitored in a Spectramax Gemini fluorescence plate reader (Molecular Devices) in black 96-well microplates using excitation/emission wavelength of 325 nm and 400 nm, respectively.

Fluorescence increase was followed for 15 min, in 1 minute’s intervals. The fluorescence/time slopes were calculated from duplicate wells and from wells without inhibitor and the 1050 values were calculated using a logistic 4—parameter model.

Test 3: Inhibition of human cathepsin D Recombinant cathepsin D (expressed as hepsin D in baculovirus, purified using standard methods and activated by incubation in sodium formate buffer pH 3.7) is incubated with the test compound at various concentrations for 1 hour at room temperature in sodium formate or sodium acetate buffer at a suitable pH within the range of pH 3.0 to 5.0. Synthetic e substrate Mca—Gly—Lys-Pro—lle—Leu-Phe-Phe—Arg—Leu-Lys(DNP)-D—Arg—NH2 is added to a final concentration of 1 to 5 pM, and the se in fluorescence is ed at excitation of 325 nm and on at 400 nm in a microplate spectro-fluorimeter for 5 to 30 minutes in 1-minute intervals. ICSO values are calculated from the percentage of inhibition of cathepsin D-activity as a function of the test compound concentration.

Test 4: Inhibition of cellular release of amyloid peptide 1-40 Chinese hamster ovary cells are ected with the human gene for amyloid sor protein.

The cells are plated at a y of 8000 cells/well into 96-well microtiter plates and cultivated for 24 hours in DMEM cell culture medium containing 10 % FCS. The test nd is added to the cells at s concentrations, and the cells are cultivated for 24 hours in the ce of the test compound. The supernatants are collected, and the concentration of amyloid peptide 1- 40 is determined using state of the art immunoassay techniques, for example sandwich ELlSA, homogenous time-resolved fluorescence (HTRF) immunoassay, or electro-chemiluminescence immunoassay. The potency of the compound is calculated from the percentage of inhibition of amyloid peptide release as a function of the test compound concentration.

PCT/[82012/054269 The compounds of the Examples showed the IC50 values ted in Table 1 below when tested in Tests 1, 2 and 4. NT = Not Tested Table 1 Test 4 BACETfiE; [pM] BACET-gslgo [PM] rgg‘g’s'gif'ém'fi 21 0.081 22 0.06 23 . 2.9 PCT/132012/054269 Test 4 Test 1 Test 2 Example No. rings'g'flc'fo1'4ia- BACE-1 leo [PM] BACE'2 'C50 [PM] NCD 1.9 10 0.84 N(.0 . 5.6 03O 0.019 O 007 0.013 31 0.18 32 0.019 33 0.066 CO4s (.0 U! (A) ‘1 Test 5: In vivo inhibitory activity of Example compounds Male e-Dawley rats, 220-280 9 weight, (Charles River, France) were dosed by oral gavage with vehicle alone (0.1% Tween80, 0.5% methylcellulose in water) or with compound suspended in vehicle at a dose of 10 micromoles compound per kilogram body weight, 4 hours prior to sacrifice.The 4 hour timepoint was selected in order to compare the activity of nds that have sufficient pharmacokinetic and biodistribution properties to reduce total brain Abeta within imately three half-lives of the rat brain Abeta40 peptide. immediately prior to sacrifice, anaesthetized rat (spontaneous inhalation, 2 — 5% lsoflurane and air) were fixed in a stereotaxic apparatus on a raised platform, with anesthesia maintained though a nose cone. The angle of the head was tilted downward, dicular to the body, and a hypodermic needle lowered through the skin behind the occipital ridge, into the na magna. Cerebrospinal fluid (CSF) was withdrawn (~50-100 uL), dispensed into tubes in Lo-bind Eppendorf tubes for Abeta40 analysis, normal Eppendorph tubes for compound analysis), frozen on dry ice and stored at -80°C until analysis. Rats were then immediately decapitated under anesthesia, trunk blood collected for analysis of compound levels and the brain retrieved. One half-forebrain was dissected by removing the cerebellum and ory bulbs, frozen in three pieces on a metal plate oled on frozen C02 and stored in tubes at — 80°C until analysis for Abeta40. For the other half-brain, olfactory bulbs were discarded and a PCT/132012/054269 sagittal slice taken from the medial aspect, weighing ~200-400 mg, placed in glass HPLC tubes and frozen on dry ice until analysis for compound levels.

Soluble Abeta40 levels in the rat brain and CSF were quantified using a Meso Scale Discovery (MSD) 96-well MULTl-ARRAY human/rodent (4G8) Abeta40 Ultrasensitive Assay (#K11OFTE-3, Meso Scale Discovery, Gaithersburg, USA). Forebrain sample homogenates were ed by sonication in 9 volumes (w/v) of ice cold TBA. Fifty pL of 2% TX-100 in mplete was added to 50 uL aliquots of the homogenate to reach a final tration of 1% TX-100 in a 1:20 dilution. Samples were incubated on ice for 15 min interrupted with 3 short vortexing steps, then centrifuged (100 000 x g, 4°C, 15 min), and 50 uL of atant collected. This was further diluted 1:5 with 3% Blocker A solution from the MSD kit to a final dilution of 1:100 and applied to the MSD plate. CSF samples containing blood were excluded. All other CSF samples were diluted with 1% Blocker A solution (from manufacturers kit) to reach a 1:20 CSF on.

Calibration curves were prepared in 1% Blocker A solution spiked with synthetic Abeta1-40 peptide. Samples and calibration standards were d in duplicate at a volume of 25 uL per well. Abeta40 concentrations of samples were estimated from the standard curve using SOFTmax PRO 4.0.

The compounds of es 2, 3, 7 and 30 of the present invention and those of Examples 22, 39 and 71 of A1 showed the effects presented in Table 2 below on Abeta lowering in rat brain and CSF when tested in Test 5. (ns. = not tically significant (Student’s t—test)) Table 2 Abeta Abeta lowering.

Example No. ure lowering in_ _ _ _ in rat forebrain rat CSF -63.6% 57.9% Present invention Abeta Abeta lowering Example No. Structure lowering in in rat forebrain rat CSF N \ F 39 \ N F o wo 2011/069934 Present Invention -7.8% (n.s.) Present Invention WO 201 34 Present Invention Blood, CSF and brain samples were also analyzed for compound levels using liquid chromatography/tandem mass spectrometry methods (LC/MS/MS). Brain samples were mixed with 2 volumes of KH2P04 buffer and homogenized using a Covaris® device. Either 30 or 50 pL of blood, CSF or tissue homogenate were spiked with a structurally related internal standard and subsequently mixed with an at least 4-fold excess volume acetonitrile (protein precipitation). The atant was either directly, or after dilution with water, injected into the LC/MS/MS system for analysis.

Due to their inhibiting properties towards proteases, and BACE-1 in particular, agents of the invention may be , e. g., in the treatment or prevention of a variety of disabilitating psychiatric, psychotic, neurological or vascular states, e. g. of a condition, e or disorder of the vascular system or of the nervous system, in which beta-amyloid generation or aggregation plays a role. Based on the inhibition of BACE—Z (beta-site APP-cleaving enzyme 2) or cathepsin D, which are close homologues of the pepsin-type aspartyl proteases and beta-secretase, and the correlation of BACE-2 or cathepsin D expression with a more tumorigenic or metastatic potential of tumor cells, the agents of the ion may also be useful as anti-cancer medicaments, e. g. in the suppression of the metastasis process associated with tumor cells.

Furthermore, based on the inhibition of BACE-2 and the ation of BACE-2 activity with TME27 ge and B cell mass, the agents of the invention may also be useful for treating or preventing loss of B cell mass and/or function, e.g. in the treatment of diabetes.

The said condition, disease or disorder of the vascular system or of the s system is exemplified by, and includes, without limitation, an anxiety disorder, such as panic disorder with or without agoraphobia, agoraphobia without history of panic disorder, an animal or other specific phobia, including a social phobia, social y disorder, anxiety, obsessive-compulsive disorder, a stress disorder, including post—traumatic or acute stress disorder, or a generalized or substance-induced anxiety disorder; a neurosis; seizures; epilepsy, especially partial seizures, , complex or partial seizures evolving to arily generalized seizures or generalized seizures [absence (typical or atypical), myoclonic, clonic, tonic, tonic-clonic or atonic seizures}; convulsions; migraine; an affective disorder, ing a sive or bipolar disorder, e. g. single—episode or recurrent major depressive disorder, major depression, a dysthymic disorder, dysthymia, depressive disorder NOS, bipolar | or r ll manic disorder or cyclothymic er; a psychotic disorder, including schizophrenia or sion; egeneration, e. g. neurodegeneration arising from cerebral ischemia; an acute, traumatic or c degenerative process of the nervous , such as Parkinson’s disease, Down’s syndrome, dementia, e. g. senile dementia, dementia with Lewy bodies or a fronto-temporal dementia, a cognitive disorder, cognitive impairment, e. g. mild cognitive impairment, memory impairment, an amyloid neuropathy, a peripheral neuropathy, mer’s e, Gerstmann-Straeussler—Scheinker syndrome, Niemann-Pick e, e. g. Niemann-Pick type C disease, brain inflammation, a brain, spinal cord or nerve injury, e. g. tic brain injury (TBl), a nerve trauma or a brain trauma, vascular amyloidosis, cerebral haemorrhage with amyloidosis, Huntington’s chorea, amyotrophic l sclerosis, multiple sclerosis or e X syndrome; scrapie; cerebral amyloid angiopathy; an encephalopathy, e. g. issible spongiform encephalopathy; stroke; an attention disorder, e. g. ion deficit hyperactivity disorder; Tourette‘s syndrome; a speech er, including stuttering; a disorder of the circadian rhythm, e. g. in subjects suffering from the effects of jet lag or shift work; pain; nociception; itch; emesis, including acute, delayed or anticipatory emesis, such as emesis induced by chemotherapy or radiation, motion sickness, or post-operative nausea or vomiting; an eating disorder, including anorexia nervosa or bulimia a; premenstrual syndrome; a muscle spasm or spasticity, e. g. in paraplegic patients; a hearing disorder, e. g. tinnitus or age-related hearing impairment; urinary incontinence; glaucoma; inclusion-body myositis; or a substance-related er, including substance abuse or dependency, including a substance, such as alcohol, withdrawal disorder. Agents of the invention may also be useful in enhancing cognition, e. g. in a t suffering from a dementing condition, such as Alzheimer's disease; as pre-medication prior to anaesthesia or a minor medical intervention, such as endoscopy, ing gastric endoscopy; or as ligands, e. g. radioligands or on emission tomography (PET) s.

Due to their inhibiting properties towards BACE-Z, compounds of the invention may be useful in the treatment or prevention a disease or disorder mediated by BACE-2. Diseases and disorders associated with BACE-Z include: metabolic syndrome (such as dyslipidemia, obesity, insulin resistance, hypertension, microalbuminemia, ricaemia, and hypercoagulability), insulin resistance, glucose intolerance (also known as impaired glucose tolerance or impaired glucose tolerance, lGT), obesity, hypertension, or diabetic complications (such as retinopathy, nephropathy, diabetic foot, ulcers, macroangiopathies, metabolic acidosis or ketosis, reactive hypoglycaemia, hyperinsulinaemia), glucose metabolic er, dyslipidaemias of different origins, atherosclerosis and related diseases, high blood pressure, chronic heart e, Syndrome X, diabetes, non-insulin-dependent diabetes mellitus, Type 2 diabetes, Type 1 diabetes, body weight disorders, weight loss, body mass index and leptin related diseases.

PCT/IBZOlZ/054269 Compounds of the invention may be suitable for preventing beta-cell degeneration such as apoptosis or necrosis of pancreatic beta cells, for improving or restoring the functionality of pancreatic cells, and/or increasing the number and/or size of pancreatic beta cells.

As used herein a patient is suffering from “obesity” if the patient exhibits at least one of: . a body mass index (BMl), i.e. the patient’s mass (in kg) divided by the square of the patient’s height (in m), of 30 or more; . an absolute waist circumference of >102 cm in men or >88 cm in women; . a waist-to-hip ratio >09 in men or >O.85 in women; or . a percent body fat >25% in men or >30% in women.

As used herein a patient is suffering from “Type 2 diabetes“ if they meet the World Health Organisation criteria for Diabetes diagnosis (Definition and diagnosis of es mellitus and intermediate hyperglycaemia, WHO, 2006), i.e. the t exhibits at least one of: . a fasting plasma glucose 27.0 mmol/l (126mg/dl); or o a venous plasma glucose 211.1 mmol/l (200mg/dl) 2 hours after ingestion of 75g oral glucose load.

As used herein a patient is suffering from “lGT” if they meet the World Health Organisation criteria for IGT diagnosis tion and diagnosis of diabetes mellitus and intermediate hyperglycaemia, WHO, 2006), i.e. the t exhibits both of: . a fasting plasma glucose <7.0 mmol/l /dl); and . a venous plasma glucose 27.8 and <11.1 mmol/l (200mg/dl) 2 hours after ingestion of 759 oral glucose load.

As used herein, the term olic syndrome" is a recognized clinical term used to be a condition comprising ations of Type ll diabetes, impaired glucose tolerance, insulin resistance, hypertension, obesity, increased abdominal girth, hypertriglyceridemia, low HDL, hyperuricaernia, hypercoagulability and/or microalbuminemia. The American Heart Association has published guidelines for the sis of metabolic syndrome, Grundy, 8., et. at, (2006) Cardiol. Rev. Vol. 13, No. 6, pp. 322-327.

For the mentioned indications, the appropriate dosage will vary depending on, e. g., the compound employed as active pharmaceutical ingredient, the host, the mode of administration, the nature and severity of the condition, disease or disorder or the effect desired. However, in general, satisfactory results in s are indicated to be ed at a daily dosage of from about 0.1 to about 100, preferably from about 1 to about 50, mg/kg of animal body . in larger mammals, for example humans, an indicated daily dosage is in the range of from about 0.5 to about 2000, preferably from about 2 to about 200, mg of an agent of the invention conveniently administered, for e, in divided doses up to four times a day or in ned release form.

An agent of the ion may be administered by any conventional route, in particular enterally, preferably orally, e. g. in the form of a tablet or capsule, or parenterally, e. g. in the form of an injectable solution or suspension.

In a further aspect, the invention relates to a pharmaceutical ition comprising an agent of the invention as active pharmaceutical ingredient in association with at least one pharmaceutically acceptable carrier or diluent and optionally in association with other auxiliary nces, such as inhibitors of cytochrome P450 enzymes, agents preventing the degradation of active pharmaceutical ingredients by cytochrome P450, agents improving or enhancing the pharmacokinetics of active pharmaceutical ingredients, agents improving or enhancing the bioavailability of active pharmaceutical ingredients, and so on, e. g. ruitjuice, ketoconazole or, preferably, ritonavir. Such a composition may be manufactured in conventional manner, e. g. by mixing its ents. Unit dosage forms contain, e. g., from about 0.1 to about 1000, preferably from about 1 to about 500, mg of an agent of the invention.

In addition, the pharmaceutical compositions of the t invention can be made up in a solid form (including without limitation capsules, tablets, pills, granules, powders or suppositories), or in a liquid form (including without limitation solutions, suspensions or emulsions). The pharmaceutical compositions can be subjected to conventional pharmaceutical operations such as sterilization and/0r can contain conventional inert ts, lubricating agents, or buffering agents, as well as adjuvants, such as preservatives, stabilizers, wetting agents, emulsifers and buffers, etc.

Typically, the pharmaceutical compositions are s or gelatin capsules comprising the active ingredient together with a) diluents, e.g., lactose, dextrose, sucrose, mannitol, sorbitol, ose and/or glycine; b) lubricants, e.g., silica, talcum, stearic acid, its magnesium or calcium salt and/or polyethyleneglycol; for tablets also c) s, e.g., magnesium aluminum silicate, starch paste, n, tragacanth, methylcellulose, sodium carboxymethylcellulose and/or polyvinylpyrrolidone; if desired d) disintegrants, e.g., starches, agar, alginic acid or its sodium salt, or effervescent es; and/or 8) absorbents, colorants, flavors and sweeteners.

Tablets may be either film coated or enteric coated according to methods known in the art. le compositions for oral administration include an effective amount of a compound of the invention in the form of tablets, lozenges, aqueous or oily suspensions, dispersible s or granules, emulsion, hard or soft capsules, or syrups or elixirs. Compositions intended for oral use are prepared according to any method known in the art for the manufacture of pharmaceutical compositions and such compositions can contain one or more agents selected from the group consisting of sweetening agents, flavoring agents, coloring agents and preserving agents in order to provide pharmaceutically elegant and ble preparations.

Tablets may contain the active ingredient in ure with nontoxic pharmaceutically acceptable excipients which are suitable for the manufacture of tablets. These excipients are, for example, inert diluents, such as calcium carbonate, sodium carbonate, lactose, m phosphate or sodium phosphate; granulating and disintegrating agents, for example, corn starch, or alginic acid; binding agents, for example, starch, gelatin or acacia; and lubricating agents, for example magnesium stearate, stearic acid or talc. The tablets are uncoated or coated by known techniques to delay disintegration and absorption in the gastrointestinal tract and thereby provide a sustained action over a longer period. For e, a time delay material such as glyceryl monostearate or glyceryl distearate can be employed. Formulations for oral use can be presented as hard gelatin capsules wherein the active ingredient is mixed with an inert solid t, for example, calcium carbonate, calcium ate or kaolin, or as soft gelatin capsules wherein the active ient is mixed with water or an oil medium, for example, peanut oil, liquid paraffin or olive oil.

Certain injectable compositions are aqueous isotonic solutions or suspensions, and suppositories are advantageously prepared from fatty emulsions or suspensions. Said compositions may be sterilized and/or contain adjuvants, such as preserving, stabilizing, wetting or emulsifying agents, solution promoters, salts for regulating the osmotic pressure and/0r buffers. in addition, they may also contain other therapeutically valuable nces Said compositions are prepared according to conventional , ating or coating methods, respectively, and contain about 01-75%, or contain about 1~50%, of the active ingredient.

Suitable itions for transdermal application include an effective amount of a compound of the invention with a suitable carrier. Carriers suitable for transdermal delivery include absorbable pharmacologically acceptable solvents to assist passage through the skin of the host. For example, transdermal devices are in the form of a bandage comprising a backing member, a reservoir ning the compound optionally with carriers, optionally a rate lling barrier to deliver the nd of the skin of the host at a controlled and predetermined rate over a prolonged period of time, and means to secure the device to the skin.

Suitable compositions for topical application, e.g., to the skin and eyes, e aqueous solutions, suspensions, ointments, creams, gels or sprayable formulations, e.g., for delivery by aerosol or the like. Such l delivery systems will in particular be appropriate for dermal application, e.g., for the treatment of skin cancer, e.g., for prophylactic use in sun creams, lotions, sprays and the like. They are thus particularly suited for use in l, including cosmetic, formulations well-known in the art. Such may contain solubilizers, izers, tonicity enhancing agents, buffers and preservatives.

As used herein a topical application may also pertain to an tion or to an asal application. They may be conveniently delivered in the form of a dry powder (either alone, as a mixture, for example a dry blend with lactose, or a mixed component particle, for example with phospholipids) from a dry powder inhaler or an l spray tation from a pressurised container, pump, spray, atomizer or nebuliser, with or without the use of a suitable propellant.

The present invention further provides anhydrous pharmaceutical compositions and dosage forms comprising the nds of the present invention as active ingredients, since water may facilitate the degradation of certain compounds.

Anhydrous pharmaceutical compositions and dosage forms of the invention can be prepared using anhydrous or low moisture containing ingredients and low moisture or low humidity conditions. An anhydrous pharmaceutical composition may be prepared and stored such that its anhydrous nature is maintained. Accordingly, anhydrous compositions are packaged using materials known to prevent exposure to water such that they can be included in suitable formulary kits. Examples of le packaging include, but are not limited to, hermetically sealed foils, plastics, unit dose containers (e. g., vials), blister packs, and strip packs.

The invention further provides pharmaceutical compositions and dosage forms that se one or more agents that reduce the rate by which the compound of the present invention as an active ingredient will decompose. Such , which are referred to herein as "stabilizers,” include, but are not limited to, antioxidants such as ascorbic acid, pH buffers, or salt s, etc.

In accordance with the foregoing, in a further aspect, the ion relates to an agent of the invention for use as a medicament, for example for the treatment or prevention of a neurological or vascular condition, disease or disorder, in which beta-amyloid generation or aggregation plays a role, or for the suppression of the metastasis process associated with tumor cells, or for the treatment or prevention of loss of B cell mass and/or function. In one embodiment, the ion relates to an agent of the invention for use in the treatment of a disease or disorder mediated by BACE-t, BACE-2 or cathepsin D ty. In another embodiment, the invention relates to an agent of the invention for use in the treatment or prevention of Alzheimer’s Disease or mild cognitive impairment. in a further embodiment, the invention relates to an agent of the ion for use in the treatment or prevention of n resistance, glucose intolerance, type 2 diabetes, y, hypertension, or diabetic complications. In yet another embodiment, the invention relates to a compound of the invention for use in the treatment of impaired glucose tolerance or Type 2 diabetes. in a further aspect, the invention relates to the use of an agent of the invention as an active pharmaceutical ingredient in a medicament, for example for the treatment or prevention of a neurological or vascular condition, disease or disorder, in which beta-amyloid generation or aggregation plays a role, or for the suppression of the metastasis process associated with tumor cells, or for the treatment or prevention of loss of B cell mass and/or function. In a further embodiment, the invention relates to the use of an agent of the ion as an active pharmaceutical ingredient in a medicament for the ent or prevention of a disease or disorder ed by BACE-t, BACE-2 or sin D activity. In one embodiment, the invention relates to the use of an agent of the invention as an active pharmaceutical ient in a medicament for the ent or prevention of Alzheimer’s Disease or mild cognitive 2012/054269 impairment. In a r embodiment, the ion relates to the use of a nd of the invention as an active pharmaceutical ingredient in a medicament for the treatment or tion of insulin resistance, glucose intolerance, type 2 diabetes, obesity, hypertension, or diabetic complications. In yet a further embodiment, the invention relates to the use of a compound of the invention as an active pharmaceutical ingredient in a medicament for the treatment or prevention of impaired glucose nce or Type 2 diabetes.

In a further aspect, the invention relates to the use of an agent of the invention for the manu- facture of a medicament for the treatment or prevention of a neurological or vascular ion, disease or disorder, in which beta-amyloid generation or aggregation plays a role, or for the suppression of the metastasis process associated with tumor cells, or for the treatment or prevention of loss of [3 cell mass and/or function. In a further embodiment, the invention relates to the use of an agent of the invention for the manufacture of a ment for the treatment or prevention of a disease or disorder mediated by BACE-t, BACE—2 or cathepsin D activity. In one embodiment, the invention relates to the use of an agent of the invention for the manufacture of a medicament for the treatment or prevention of Alzheimer‘s Disease or mild ive impairment. In a further embodiment, the invention relates to the use of a compound of the invention as an active pharmaceutical ingredient in a medicament for the treatment or prevention of insulin resistance, e intolerance, type 2 es, obesity, hypertension, or diabetic complications. In yet a further embodiment, the invention relates to the use of a compound of the invention as an active pharmaceutical ient in a medicament for the treatment or prevention of impaired glucose tolerance or Type 2 diabetes.

In a further aspect, the invention relates to a method for the treatment or tion of a neurological or vascular condition, disease or er, in which beta—amyloid generation or aggregation plays a role, or for the suppression of the asis process associated with tumor cells, or for the treatment or tion of loss of B cell mass and/or function, in a subject in need of such treatment, prevention or suppression, which method ses administering to such subject an effective amount of an agent of the invention. In one embodiment, the invention relates to a method of modulating BACE-t, BACE—Z or cathepsin D activity in a subject, wherein the method comprises administering to the subject a therapeutically effective amount of an agent of the invention. In another embodiment, the ion relates to a method for the treatment or prevention of a disease mediated by BACE-1, BACE-2 or cathepsin D activity, in a subject in need of such treatment or prevention, which method ses administering to such subject an effective amount of an agent of the invention. In yet another embodiment, the WO 27188 PCT/IBZOlZ/054269 invention relates to a method for the treatment or prevention of Alzheimer’s Disease or mild cognitive impairment, in a subject in need of such treatment or prevention, which method comprises administering to such subject an effective amount of an agent of the invention. In a r embodiment, the ion s to a method for the treatment or prevention of insulin resistance, glucose intolerance, type 2 diabetes, obesity, hypertension, or diabetic complications, in a subject in need of such treatment or tion, which method comprises administering to such subject a therapeutically effective amount of a compound of the invention. in yet a further embodiment, the ion relates to a method for the treatment or tion of impaired glucose nce or Type 2 diabetes, in a t in need of such treatment or prevention, which method comprises administering to such subject a therapeutically effective amount of a compound of the invention.

An agent of the invention can be administered as sole active pharmaceutical ient or as a combination with at least one other active pharmaceutical ingredient effective, e. g., in the treatment or tion of a neurological or vascular condition, disease or disorder, in which beta-amyloid generation or aggregation plays a role, or in the suppression of the metastasis process associated with tumor cells, or in the treatment or prevention of loss of B cell mass and/or function. Such a pharmaceutical combination may be in the form of a unit dosage form, which unit dosage form comprises a predetermined quantity of each of the at least two active components in association with at least one pharmaceutically acceptable carrier or diluent.

Alternatively, the ceutical combination may be in the form of a package comprising the at least two active components separately, e. g. a pack or dispenser-device adapted for the concomitant or separate administration of the at least two active ents, in which these active components are separately arranged. In a further aspect, the invention relates to such pharmaceutical combinations.

In a further aspect, the invention therefore relates to a combination comprising a therapeutically effective amount of an agent of the invention and a second drug substance, for simultaneous or sequential administration.

In one embodiment, the invention provides a product comprising an agent of the ion and at least one other therapeutic agent as a ed preparation for simultaneous, separate or sequential use in y. In one embodiment, the therapy is the treatment of a disease or condition mediated by BACE-t, BACE-2 or cathepsin D activity, such as Alzheimer’s Disease, mild cognitive impairment, impaired glucose tolerance or type 2 diabetes. wo 2013/027188 PCT/[82012/054269 In one embodiment, the invention provides a pharmaceutical composition comprising an agent of the invention and another therapeutic agent(s). Optionally, the pharmaceutical composition may comprise a pharmaceutically acceptable carrier, as described above. in one embodiment, the invention provides a kit comprising two or more separate pharmaceutical compositions, at least one of which contains an agent of the invention. In one embodiment, the kit comprises means for separately retaining said compositions, such as a container, divided bottle, or divided foil . An example of such a kit is a blister pack, as typically used for the packaging of tablets, capsules and the like. The kit of the invention may be used for stering different dosage forms, for example, oral and parenteral, for administering the te compositions at different dosage intervals, or for titrating the separate compositions against one another. To assist compliance, the kit of the invention typically comprises directions for administration.

In the combination therapies of the invention, the agent of the ion and the other therapeutic agent may be manufactured and/or formulated by the same or different cturers. Moreover, the compound of the invention and the other therapeutic may be brought together into a combination therapy: (i) prior to release of the combination t to physicians (e.g. in the case of a kit sing the compound of the invention and the other therapeutic agent); (ii) by the physician themselves (or under the guidance of the physician) shortly before administration; (iii) in the patient themselves, e.g. during sequential stration of the compound of the invention and the other eutic agent. Accordingly, the invention provides an agent of the invention for use in the ent of a disease or condition mediated by BACE-i, BACE—2 or cathepsin D activity, such as Alzheimer’s Disease, impaired glucose tolerance or type 2 diabetes, wherein the medicament is prepared for administration with another therapeutic agent. The invention also es the use of another therapeutic agent for treating a disease or condition mediated by BACE—i, BACE-2 or sin D activity, such as Alzheimer’s Disease, impaired glucose nce or type 2 diabetes, wherein the medicament is stered with an agent of the invention.

The ion also provides an agent of the invention for use in a method of treating a disease or condition mediated by BACE-1, BACE-Z or cathepsin D activity, such as mer’s Disease, impaired glucose tolerance or type 2 diabetes, wherein the agent of the invention is prepared for administration with r therapeutic agent. The invention also provides another therapeutic agent for use in a method of treating a disease or condition mediated by , BACE-Z or cathepsin D activity, such as Alzheimer’s Disease, impaired glucose tolerance or type 2 diabetes, wherein the other therapeutic agent is prepared for administration with an agent of the invention. The invention also provides an agent of the invention for use in a method of treating a disease or condition mediated by BACE-t, BACE—2 or cathepsin D activity, such as Alzheimer’s Disease, impaired glucose tolerance or type 2 diabetes, wherein the agent of the invention is administered with another therapeutic agent. The invention also provides another therapeutic agent for use in a method of treating a disease or condition mediated by BACE-i, BACE-2 or cathepsin D activity, such as Alzheimer’s Disease, impaired glucose nce or type 2 diabetes, wherein the other therapeutic agent is administered with an agent of the invention.

The invention also provides the use of an agent of the invention for treating a disease or condition mediated by BACE-t, BACE-2 or cathepsin D activity, such as Alzheimer’s Disease, impaired e nce or type 2 diabetes, wherein the patient has previously (e.g. within 24 hours) been treated with r therapeutic agent. The ion also provides the use of another therapeutic agent for treating a disease or condition mediated by BACE-i, BACE-Z or cathepsin D activity, such as Alzheimer’s Disease, impaired glucose nce or type 2 diabetes, wherein the patient has previously (e.g. within 24 hours) been treated with an agent of the invention.

In one embodiment, the ion relates to a compound of the invention, or a pharmaceutically able salt thereof, in combination with another therapeutic agent wherein the other therapeutic agent is ed from: (a) acetylcholinesterase inhibitors, such as donepezil (AriceptTM), rivastigmine nTM) and galantamine (RazadyneTM); (b) glutamate antagonists, such as memantine (NamendaTM); (C) antidepressant tions for low mood and irritability, such as citalopram (Celexa TM), fluoxetine (ProzacTM), paroxeine TM), sertraline (ZoloftT'V') and trazodone (DesyrelTM); (d) anxiolytics for anxiety, restlessness, ly disruptive behavior and ance, such as Iorazepam (Ativanm) and oxazepam (SeraxTM); (e) antipsychotic medications for hallucinations, delusions, aggression, ion, hostility and uncooperativeness, such as aripiprazole (AbilifyTM), clozapine (ClozarilTM), haloperidol (HaldolTM), olanzapine (ZyprexaTM), quetiapine (SeroquelTM), risperidone (RisperdalTM) and ziprasidone (GeodonTM); (f) mood stabilizers, such as carbamazepine (TegretolTM) and divalproex (Depakotem); (g) nicotinic apha — 7 agonists; (h) mGluR5 antagonists; (i) H3 ts; and (j) amyloid therapy vaccines.

Thus, in one embodiment, the invention provides a ceutical composition comprising; i) a compound of the invention, or a pharmaceutically acceptable salt thereof, and ii) at least one compound selected from a) acetylcholinesterase inhibitors, b) glutamate antagonists, c) antidepressant medications, d) anxiolytics, e) antipsychotic medications, (f) mood stabilizers, (g) nicotinic apha — 7 agonists, (h) mGlu R5 antagonists, (i) H3 agonists, (j) amyloid therapy vaccines, and ii) one or more ceutically acceptable carriers.

In another ment, the invention relates to a nd of the ion, or a pharmaceutically acceptable salt thereof, in combination with another therapeutic agent wherein the other therapeutic agent is selected from: wo 2013/027188 ZOlZ/054269 a) abetic agents, such as insulin, n derivatives and mimetics; insulin secretagogues such as the sulfonylureas, e.g., Glipizide, glyburide and Amaryl; insulinotropic sulfonylurea receptor ligands such as meglitinides, e.g., nateglinide and repaglinide; protein tyrosine atase-1B (PTP-1 B) inhibitors such as PTP-112; GSK3 (glycogen synthase kinase-3) inhibitors such as 88—517955, SB-4195052, SB-216763, NN-57—05441 and NN05445; RXR ligands such as GW-0791 and AGN-194204; sodium-dependent glucose cotransporter inhibitors such as T4095; glycogen phosphorylase A inhibitors such as BAY R3401; biguanides such as metformin; alpha-glucosldase inhibitors such as acarbose; GLP-1 (glucagon like peptide-1), GLP-1 analogs such as Exendin-4 and GLP—1 mimetics; and DPPlV (dipeptidyl ase lV) tors such as liptin; b) hypolipidemic agents such as 3-hydroxy~3~methyl~glutaryl coenzyme A (HMG-CoA) reductase inhibitors, e.g., lovastatin, pitavastatin, simvastatin, pravastatin, cerivastatin, mevastatin, atin, fluvastatin, dalvastatin, atorvastatin, rosuvastatin and rivastatin; squalene synthase inhibitors; FXR (farnesoid X receptor) and LXR (liver X or) ligands; cholestyramine; fibrates; nicotinic acid bile acid binding resins such as cholestyramine; fibrates; nicotinic acid and other GPR109 agonists; cholesterol absorption inhibitors such as ezetimibe; CETP inhibitors (cholesterol-ester-transfer-protein inhibitors), and aspirin; c) anti-obesity agents such as orlistat, sibutramine and Cannabinoid Receptor 1 (081) antagonists e.g. rimonabant; and d) anti-hypertensive agents, e.g., loop diuretics such as ethacrynic acid, furosemide and torsemide; ensin converting enzyme (ACE) inhibitors such as benazepril, captopril, enalapril, fosinopril, pril, moexipril, perinodopril, quinapril, ramipril and trandolapril; inhibitors of the TPase ne pump such as digoxin; neutralendopeptidase (N EP) inhibitors; ACE/NEP inhibitors such as omapatrilat, sampatrilat and fasidotril; angiotensin II antagonists such as candesartan, eprosartan, irbesartan, losartan, telmisartan and valsartan, in particular valsartan; renin inhibitors such as ditekiren, zankiren, terlakiren, ren, RO 66-1132 and R0— 66-1168; B-adrenergic receptor blockers such as acebutolol, atenolol, betaxolol, bisoprolol, metoprolol, l, propranolol, sotalol and timolol; inotropic agents such as digoxin, mine and milrinone; calcium channel blockers such as amlodipine, bepridil, diltiazem, felodipine, ipine, nimodipine, pine, nisoldipine and verapamil; aldosterone receptor antagonists; and aldosterone synthase inhibitors. e) agonists of peroxisome proliferator-activator ors, such as fenofibrate, pioglitazone, rosiglitazone, tesaglitazar, EMS-298585, L-796449, the compounds specifically described in the patent application WC 2004/103995 i.e. compounds of examples 1 to 35 or compounds specifically listed in claim 21, or the compounds specifically described in the patent application WO 03/043985 i.e. compounds of examples 1 to 7 or compounds specifically listed in claim 19 and especially (R)—1-{4—[5-methyl-2—(4-trifluoromethyI-phenyl)-oxazoly|methoxy]— benzenesulfonyl}—2,3—dihydro-1H—indoIecarboxylic or a salt thereof.

Thus, in one embodiment, the invention provides a pharmaceutical composition comprising; i) a compound of the invention, or a pharmaceutically acceptable salt thereof, and ii) at least one compound selected from a) antidiabetic , b) hypolipidemic agents, 0) anti-obesity agents, d) anti-hypertensive agents, e) agonists of peroxisome proliferator—activator receptors, and ii) one or more ceutically acceptable carriers.

Other specific anti—diabetic compounds are described by Patel Mona in Expert Opin Invest/'9 Drugs, 2003, 12(4), 623~633, in the figures 1 to 7.

The structure of the therapeutic agents identified by code numbers, generic or trade names may be taken from the actual edition of the standard compendium “The Merck index" or from ses, e.g., Patents international (e.g. IMS World ations).

Examples NMR Methods Proton spectra are recorded on a Bruker 400 MHz ultrashield spectrometer unless othen/vise noted. Chemical shifts are ed in ppm relative to methanol (6 3.31), dimethyl ide (5 2.50), or form (6 7.29). A small amount of the dry sample (1-5 mg) is dissolved in an PCT/132012/054269 appropriate deuterated solvent (0.7 mL). The shimming is automated and the spectra obtained in accordance with normal procedure. l Chromatography Conditions UPLC method H1 (RtH1): olumn dimensions: 2.1 x 50 mm HPLC-column type: Acquity UPLC HSS T3, 1.8 pm HPLC-eluent: A) water + 0.05 Vol.-% formic acid + 3.75 mM ammonium acetate B) ACN + 0.04 Vol.-% formic acid HPLC—gradient: 2 - 98 % B in 1.4 min, 98% B 0.75 min, flow = 1.2 ml / min HPLC-column temperature: 50 °C UPLC method H2 (RtHz): HPLC-column dimensions: 2.1 x 50 mm HPLC-column type: Acquity UPLC HSS T3, 1.8 pm HPLC-eluent: A) water + 0.05 Vol.-% formic acid + 3.75 mM ammonium e B) ACN + 0.04 Vol.-% formic acid HPLC—gradient: 5 - 98 % B in 1.4 min, 98% B 0.4 min, flow = 1.0 ml / min olumn temperature: 60 °C LCMS method H3 (RtHg): HPLC-column dimensions: 4.0 x 20 mm HPLC-column type: Mercury MS Synergi, 2 pm HPLC-eluent: A) water + 0.1 Vol.-% formic acid, B) ACN HPLC-gradient: 0.5 min 70% B, 70-100°/o B in 1 min, 0.9 min 100% B, flow = 2.0 ml / min HPLC-column temperature: 30 °C LCMS method H4 (RtH4): HPLC-column dimensions: 2.1x80 mm HPLC-column type: Ascentis Express C18, 2.8 pm HPLC-eluent A) water + 0.05 Voi.-°/o formic acid + 3.75 mM ammonium acetate B) ACN + 0.04 Voi.-% formic acid HPLC-gradient: 2 — 98 % B in 1.4 min, 0.75 min 98% B, flow = 1.2 mi / min HPLC-column temperature: 50 °C HPLC method H5 : HPLC—column dimensions: 3.0 x 30 mm HPLC-column type: Zorbax SB-C18, 1.8 pm HPLC—eluent: A) water + 0.05 VoI.-% TFA; B) ACN + 0.05 V0|.-% TFA HPLC-gradient: 0-100 % B in 3.25 min, 0.75 min 100% B, flow = 0.7 ml / min olumn temperature: 35 °C UPLC method H6 (RtHs): HPLC-column dimensions: 2.1 x 50 mm HPLC-column type: Acquity UPLC HSS T3, 1.8 pm HPLC-eiuent: A) water + 0.1 VoI.-% TFA; B) ACN + 0.1 Voi.-% TFA H adient: 10-95 % B in 1.5 min, flow: 1.0 ml/min HPLC method H7 (Rtm): HPLC-column dimensions: 3.0 x 30 mm HPLC-column type: Zorbax SB-C18, 1.8 pm HPLC-eluent: A) water + 0.05 VoI.-% TFA; B) ACN + 0.05 Voi.-% TFA HPLC-gradient: 30-100 % B in 3.25 min, 0.75 min 100% B, flow = 0.7 ml / min HPLC-column temperature: 35 °C PCT/IBZOlZ/054269 HPLC method H8 (RtHB): HPLC-cotumn dimensions: 3.0 x 30 mm HPLC—coiumn type: Zorbax SB-C18, 1.8 pm HPLC-eluent: A) water + 0.05 V0|.-°/o TFA; B) ACN + 0.05 V0l.-% TFA HPLC-gradient: 10-100 % B in 3.25 min, 0.75 min 100% B, flow = 0.7 mi / min HPLC—column temperature: 35 °C Abbreviations ACN itrite ACOH acetic acid aq. aqueous 80020 tert-butyl dicarbonate Bu Li butyl m CSA campher sulfonic acid DAST diethylaminosulfur trifluoride dba dibenzylideneacetone DCM dichtoromethane DEAD diethyl azodicarboxytate DIAD diisopropyt azodicarboxytate DIPEA diisopropyiethylamine DMA dimethylacetamide DMF dimethylformamide DMSO dimethylsulfoxide DMTr 4,4’-dimethoxytrityl DPPF 1,1'-bis—diphenylphosphino—ferrocene EDC 1-(3-dimethyiaminopropyt)—3-ethyicarbodiimide Eth triethylamine EtOAc ethyl e EtO H ethanol h hour(s) WO 27188 hex hexane HOAt 1-hydroxyaza-benztriazole HPLC high performance liquid chromatography LCMS liquid chromatography with mass spectrometry LDA lithium diisopropylamide mCPBA 3-chloroperbenzoic acid MeOH methanol min minute(s) MS mass spectrometry NEt3 triethylamine NMR nuclear ic resonance spectrometry Rf retention factor (TLC) RP reverse phase Rt retention time rt room temperature sat. saturated TBME tert-butyI-methyi-ether TFA trifluoroacetic acid THF tetrahydrofu ran TLC thin layer chromatography Xantphos 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene Exam le1: 5-C anometh l- ridine-Z-carbox lic acid 6- amino-5 uoro a) 2-Bromofluorotriethylsilanylpyridine To a solution of diisopropylamine (25.3 g, 250 mmol) in THF (400 ml) was added n-BuLi (100 ml, 2.5 mol/L in hexanes) below -50 °C. A soiution of 2—bromo-5—fluoropyridine (41.9 g, 238 mmol) in THF (60 ml) was added to the lution at -78 °C in a dropwise manner below -63 °C. After 2012/054269 60 minutes at -78 °C triethylchlorosilane (44 ml, 262 mmol) was added in a fast manner g the temperature below -50 °C. The cooling bath was removed and the reaction mixture was allowed to reach -20 °C. The on mixture was poured on a mixture of 1M aq. HCI (250 ml) and aq. NH4Cl (10%). Tert-butyl methyl ether was added and the layers were separated. The organic phase was washed with brine, dried over magnesium sulfate, filtered and evaporated to give a yellow liquid. Distillation (bp. 99101" C, 0.5 mmHg). afforded the title compound as a slightly yellow liquid: 66.26 g (96 % yield). 1H-NMR (400 MHz, CDCI3): 6 8.17 (s, 1H), 7.42 (d, 1H), .97 (m, 9H), 0.92-0.87 (m, 6H). b) 1-(6-Bromofluorotriethylsilanyl-pyridinyl)-ethanone To a on of diisopropylamine (25.4 g, 251 mmol) in THF (500 ml) was added n-BuLi (100 ml, 2.5 mol/L in hexanes) below -50 °C. A solution of 2-bromofluoro-4—triethylsilanyl-pyridine (56.049, 193 mmol) in THF (60 ml) was added to the LDA—solution at —78 °C in a dropwise manner below -65 °C. After 70 minutes at -78 °C DMA (23.51 ml, 251 mmol) was added dropwise in a fast manner to the deep red solution keeping the temperature below —57 °C. After 15 minutes the cooling bath was removed and the reaction mixture was allowed to reach -40 °C.

The cold reaction mixture was poured on a mixture of 2M aq. HCI (250 ml) / water (200 ml)/ brine (100 ml). Tert.-butyl methyl ether was added and the layers were separated. The organic phase was washed twice with brine, dried over magnesium sulfate, filtered and evaporated to give a yellow oil. The crude product (64.76 g) was tographed over silica gel (hexanefl'BME) to give the title compound as a yellow liquid: 58.3 g (91 % yield).

TLC (hexane/TBME 99:1): Rf = 0.25; 1H-NMR (400 MHZ, CDCI3): 6 7.55 (d, 1H), 2.67 (3, 3H), 0.98-0.93 (m, 9H), 0.91—0.85 (m, 6H). c) (R)Methyl-propanesulfinic acid[1-(6-bromofluorotriethylsilanyl-pyridin-Z-yl)- eth-(E)-ylidene]-amide A mixture of titantetraethoxide (4.26 g, 18.69 mmol), (R)—tert.-butylsulfinamide (1.246 g, 10.28 mmol) and romofluoro-4—triethylsilanyl-pyridin-2—yl)—ethanone (3.45 g, 9.34 mmol, 90 % pure) in THF (25 ml) was refluxed under a nitrogen atmosphere for 6 hours. The cold reaction e was poured onto icecold brine (200 ml) with gentle stirring. The itate was filtered through a pad of hyflo and and washed with ethyl acetate. The filtrate was diluted with ethyl acetate and washed with brine, dried over sodium sulfate, filtered and evaporated. The crude PCT/IBZOIZ/054269 yellow oil (4.55 g) was chromatographed over silica gel (cyclohexane/ethyl acetate 94:6) to give the title compound as a yellow oil. 3.35 g (82 % yield).

TLC (cyclohexane/ethyl acetate 5:1): R = 0.50; HPLC: Rtm = 1.56 min; ESlMS: 435, 437 [(M+H)*, 1Br]; 1H-NMR (400 MHz, : 6 7.48 (d, 1H), 2.28 (s, 3H), 1.34 (s, 9H), 1.01-0.98 (m, 9H), 0.92- 0.89 (m, 6H). d) (R)(6-Bromofluorotriethylsi|anyI-pyridin-Z-yl)-2,2-difluoro((R)methyl- e-Z-sulfinylamino)-butyric acid ethyl ester To a suspension of zinc (466 mg, 7.12 mmol) and copper(l) chloride (34 mg, 0.344 mmol) in dry THF (20 ml) were added 3 drops of trimethylchlorosilane under en to activate the zinc.

After 10 minutes ethyl 2-bromo-2,2—difluoroacetate (1.398 g, 6.89 mmol) was added slowly by syringe over a period of 10 minutes at 25 °C (slightly rmic). The on mixture was kept in an ultrasound bath for 45 minutes. This black fine suspension was added dropwise to a solution of (R)methyI-propane-Z-sulfinic acid [1 -(6-bromofluorotriethylsilanyl-pyridin yl)-eth-(E)-ylldene]-amide) (19, 2.296 mmol) in dry THF (10 ml) at rt under inert atmosphere.

After 4 h at rt the reaction mixture was added to a cold aq. ammonium chloride solution (5 %) and was diluted with ethyl acetate. The organic phase was washed with aq. citric acid (5% solution), water, sat. sodium bicarbonate solution and brine, dried over sodium sulfate, filtered and concentrated. The crude brownish oil (1.5 g) was chromatographed over silica gel (cyclohexane/ethyl acetate 83:17) to give the title compound as a light yellow oil. 984 mg (77% yield).

TLC (cyclohexane/ethyl acetate 2:1): Rf = 0.46; HPLC: Rtm = 1.54 min; ESlMS: 559, 561 [(M+H)", 1Br]; 1H-NMR (400 MHz, : 6 7.40 (d, 1H), 5.48 (6, NH), 4.38 (q. 2H), 2.07 (s, 3H), 1.26 (s, 9H), 1.00-0.96 (m, 9H), 0.90-0.86 (m, 6H).

Minor diastereoisomer R,« = 0.64 (2:1 cyclohexane:ethyl acetate). e) (R)(6-Bromofluoro-pyridinyI)-2,2-difluoro((R)methyl-propane sulfinylamino)—butyric acid ethyl ester PCT/[132012/054269 Freshly ground KF (195 mg, 3.36 mmol) was added to a solution of (R)(6-bromo-3~fluoro triethylsilanyI-pyridinyl)-2,2-difluoro—3-((R)methyI-propanesuifinylamino)-butyric acid ethyl ester (940 mg, 1.68 mmol) and acetic acid (0.192 ml, 3.36 mmol) in THF (7 ml). DMF (7 ml) was added and the suspension was stirred at rt. After 2 h the reaction mixture was d with ethyl e and washed with sat. sodium bicarbonate solution and brine, dried over sodium e, filtered and evaporated. The crude product (733 mg) was chromatographed over silica gel (cyclohexane/ethyl acetate 7:3) to give the title compound as a slightly yellow oil. 664 mg (88% yield).

TLC (cyclohexane/ethyl acetate 1:1): R = 0.38; HPLC: Rtm = 1.08 min; ESlMS: 445, 447 [(M+H)", 1Br]; ‘H-NMR (400 MHz, 00013): 5 7.51-7.46 (dd, 1H), 7.35 (t, 1H), 5.38 (br. s, 1H, NH), 4.37 (q, 2H), 2.07 (s, 3H), 1.39 (t, 3H), 1.26 (s, 9H). f) (R)Methyl-propanesulfinic acid [(R)(6-bromofluoro-pyridinyl)-2,2,difluoro hydroxymethy|-propyl]amide To a on of (R)(6-bromofluoro—pyridin—2-yl)-2,2-difluoro((R)methyl-propane sulfinylamino)-butyric acid ethyl ester (513 mg, 1.15 mmol) in THF (11.5 ml) was added lithiumborohydride (52.8 mg, 2.30 mmol). The slightly exothermic reaction was stirred for 2.5 h at room temperature. Crushed ice was added and the reaction mixture was diluted with ethyl e. The organic phase was washed with water and brine, dried over sodium sulfate, filtered and evaporated; 465 mg (quantitative yield) slightly yellow resin which was used without ation in the next step.

TLC (toluene/ethyl acetate 7:3): R = 0.16; HPLC: Rtm = 0.93 min; ESIMS: 403, 405 [(M+H)+, 1Br]; 1H—NMR (400 MHZ, CDCI3): 5 7.52 (dd, 1H), 7.38 (dd, 1H), 5.84(S broad, 1H), 4.32 (dd, 1H), 4.02 (m, 1H), 3.81 (m, 1H), 2.05 (S, 3H), 1.31 (s, 9H). 9) (R)Amino(6-bromofluoro-pyridinyl)—2,2-difluoro-butanol To a solution of (R)methyl-propane—Z-sulfinic acid [(R)(6-bromofluoro-pyridin—Z—yi)- 2,2,difluoro-3—hydroxy—1-methyI-propyl]amide (1.33 g, 3.30 mmol) in dioxane (26.6 ml) was added HCl/dioxane 4N (3.3 ml, 13.19 mmol). The reaction mixture was stirred for 21 hours at room temperature. The solvent was ated and to the residue was added ethyl acetate and crushed ice. The organic phase was extracted with water and was made ne with solid potassium carbonate. The aqueous phase was extracted with ethyl acetate, dried over sodium sulfate, d and evaporated. 930 mg colourless solid (94% yield).

TLC (toluene/ethyl acetate 7:3): R = 0.25; HPLC: Rtm = 0.44 min; ESIMS: 299, 301 [(M+H)“, 1Br]; 1H-NMR (400 MHz, DMSO~D6): 5 7.73 (m, 2H, Ar), 7.29 (broad s, 1H), 6.69 (broad s, 1H), 5.30 (t, 1H), 3.79 (m, 2H), 1.57 (d, 3H). h) (6-Bromofluoro-pyridin-Z-yl)-5,5-difluoromethyl-5,6-dihydro-4H-[1,3]oxazine- 2-ylamine A solution of (R)amino(6-bromofiuoro-pyridin—2-yl)-2,2-difluoro-butanol (150 mg, 0.49 mmol) and yan (106 mg, 1 mmol) in ethanol (5 ml) was heated for 19 h at 85 °C in a capped microwave vial. The solvent was evaporated and the residue was dissolved in ethyl acetate. The organic phase was washed with aq. ammonia, water and brine, dried over sodium sulfate, d and evaporated. The crude product (136 mg) was chromatographed over silica (toluene/ethyl acetate 1:1) to afford recovered starting material (27 mg) and the title compound: 64 mg (40% yield).

TLC (toluene/ethyl acetate 1:1): R, = 0.17; HPLC: Rtm = 0.56 min; ESIMS: 324, 326 [(M+H)+, 1Br]; 1H-NMR (400 MHz, DMSO-De): 5 7.69 (m, 2H), 5.82 (broad s, 2H), 4.36 (m, 1H), 4.17 (m, 1H), 1.63 (s, 3H). i) {(R)—4-(6-Bromofluoro-pyridinyl)-5,5-difluoromethyl-5,6-dihydro-4H-[1,3]oxazine- 2-yl]-carbamic acid tert-butyl ester A solution of (R)-4—(6-bromo-3—fluoro-pyridinyl)~5,5-difluoromethyI-5,6—dihydro-4H- [1,3]oxazine—2—ylamine (60 mg, 0.185 mmol), Boc—anhydride (42.3 mg, 0.194 mmol) and Hiinig’s base (64.7 pl, 0.37 mmol) in dichloromethane (1.9 ml) was stirred at rt for 3 days. The reaction mixture was diluted with ethyl acetate, washed with as. Bicarbonate solution, water and brine, dried over sodium e, filtered and evaporated, 76 mg (85 % yield).

PCT/IBZOIZ/054269 TLC (toluene/ethyl acetate 7:3): R7 = 0.38; HPLC: Rtm = 1.08 min; ESlMS: 424, 426 [(M+H)+, 1Br]; 1H-NMR (400 MHz, : 6 7.58—7.30 (m, 2H, Ar), 4.40-4.30 (m, 2H), 1.90 (broad s, 3H), 1.52 (s, 9H). j) ((R){6-[(5-Cyanomethyl-pyridinecarbonyl)-amino]f|uoro-pyridin-Z-yl}-5,5- difluoromethyl-5,6-dihydro-4H-[1,3]oxazinyl)-carbamic acid tert-butyl ester A degassed mixture of [(R)~4—(6-bromo—3-fluoro-pyridin—2-yI)-5,5-difluor0methyl-5,6—dihydro- 4H-[1,3]0xazine—2-yl]—carbamic acid tert—butyl ester (70 mg, 0.145 mmol), 5-cyano-3—methyl- pyridine—2-carboxylic acid amide (25.7 mg, 0.160 mmol), Xantphos (30.2 mg, 0.052 mmol), caesium carbonate (67.6 mg, 0.203 mmol) and Pd2(dba)3 (16.45 mg, 0.017 mmol) was heated under argon in dioxane (2.9 ml) at 60 °C for 5 hours. The reaction mixture (grey-brown suspension) was diluted with ethyl e and aq. bicarbonate solution and was then filtered.

The filtrate was washed with water and brine, dried over sodium sulfate, filtered and evaporated. 166 mg brown solid. The crude product was chromatographed over silica gel (toluene/ethyl acetate 7:3) to give the title compound as a white solid. 28 mg (38 % yield).

TLC (toluene/ethyl acetate 7:3): R: = 0.25; HPLC: Rtm = 1.18 min; ESIMS: 505 [(M+H)*]; 1H-NMR (400 MHz, 00013): 5 10.7 (broad s, 1H), 10.49 (broad s, 1H), 8.77 (d, 1H), 8.49 (broad d, 1H), 7.99 (d, 1H), 7.6 (broad t, 1H), 4.49 — 4.30 (m, 2H), 2.88 (s, 3H), 1.92 (broad s, 3H), 1.55 (s, 9H). k) 5-Cyanomethyl-pyridinecarboxylic acid [6-((R)amino-5.5-difluoromethyl-5.6- dihydro-4H-[1,3]oxazin-4—yl)—5-fluoro-pyridinyl]-amide A solution of ((R){6-[(5~cyano-3—methyl-pyridinecarbonyl)—amino]fiuoro-pyridinyl}-5,5- difluoro-4—methyl-5,6—dihydro-4H-[1,3]oxazin—2-yl)—carbamic acid tert-butyl ester (26 mg, 0.052 mmol) and TFA (200 pl, 2.6 mmol) in dichloromethane (1.3 ml) was stirred at rt for 5 hours. The on mixture was evaporated and the residue diluted with aq. a and ethyl acetate, washed with water and brine, dried over sodium sulfate, filtered and evaporated. 24 mg ish solid. Trituration with exane afforded the title compound as a slightly yellow solid. 17 mg (80 % yield).

HPLC: RtH1 = 0.72 min; ESIMS: 405 [(M+H)*]; 1H-NMR (400 MHz, DMSO-De): 6 10.71 (broad s, 1H, NH), 9.01 (broad s, 1H), 8.43 (broad s, 1H), 8.19 (broad d, 1H), 7.76 (t, 1H), 5.77 (broad s, 2H, NHZ), 4.32 (m, 2H), 2.61 (s, 3H), 1.67 (broad s, 3H).

Example 2: The nd listed in Table 1 was prepared by a procedure analogous to that used in Example 1.

MS [mlz; Compound 1H-NMR (8; CDCI3) (M+1)+] .15 (br. s, 1H), 8.85 (d, 1H), 8.39 (dd, 1H), 8.21 (d, 1H), 7.53 (dd, 3—Chlorocyano-pyridinecarboxylic 1H), 4.22-4.14 (m, 2H), acid [6-((R)—2-amino-5,5-difluoro 1.84 (t, 3H) methyl-5,6-dihydro-4H—[1,3} oxazin—4-yl)— -fluoro-pyridin-Z-yI]—amide Example 3: 3-Chlorocyano-pyridinecarboxylic acid [6-((R)amino-5,5-difluoro-4,6,6- trimethyl-S,6-dihydro-4H-[1,3] oxazinyl)fluoro-pyridin-Z-yl1-amide a) Methyl-propanesulfinic acid [(R)(6-bromofluoro-pyridinyl)-2,2,difluoro- 3-hydroxy-1,3-dimethyl-butyl]-amide To methylmagnesium chloride BM in THF (38.3 ml, 115 mmol) was added a on of (R)—3-(6- bromofluoro-pyridinyl)-2,2-difluoro—3-((R)—2—methyl-propane-2—su|finylamino)-butyric acid ethyl ester (5.12 g, 11.5 mmol, example 1a)) in THF (102 ml) at rt. After 2 hr stirring the reaction 2012/054269 was quenched with addition of an aqueous ammonium chloride solution. The mixture was diluted with ethyl acetate and washed with water and brine, dried over sodium sulfate, ed and evaporated. The crude t (4.78 g) was chromatographed over silica gel (cyclohexane/ethyl acetate 6:4) to give the title compound as a colourless solid. 2.97 g (59.9 % yield).

TLC (cyclohexane/ethyl acetate 6:4, silica gel, UV 254): R: = 0.32; LC—MS: Rtm = 1.09 min; (100 % pure; ESl+-MS: m/z 431 [(M+H)*]); 1H-NMR (400MHz ,DMSO—de) 5 = 7.83 - 7.70 (m, 2 H), 6.10 (s, 1 H), 5.48 (s, 1 H), 1.93 (s, 3 H), 1.23 (s, 3 H), 1.18 (s, 9 H), 1.07 (s, 3 H). b) (R)(6-Bromofluoro-pyridinyl)-5,5-difluoro-4,6,6-trimethyl-5,6-dihydro-4H- [1 ,3]oxazinylamine A solution of (R)methyI—propane—2—sulfinic acid [(R)—1—(6-bromofluoro-pyridin-Z-y|)- 2,2,difluorohydroxy—1,3—dimethyI-butyl]-amide (2.95 g, 6.84 mmol) and cyanogen bromide (2.24 g, 20.52 mmol) in dry ethanol (68 ml) was sealed with a glass stopper and heated at 85 °C for 9 hr. The reaction solution was evaporated in vacuo and the crude product was taken up with ethyl acetate and 2M aq. a. The organic phase was washed with water and brine, dried over sodium sulfate, ed and evaporated. The crude product (2.74 g) was chromatographed over silica gel (toluene/ethyl acetate 6:4) to give the title compound as a colourless solid. 1.19 g (48.9 % yield).

LC-MS: Rim = 67 min; (99 % pure; ES|+-MS: m/z 352 [(M+H)+], 354); 1H—NMR(400MHz,DMSO-d5)5 = 7.72 - 7.59 (m, 2 H), 5.83 (br. s, 2 H), 1.87 (d, J: 4.0 Hz, 3 H), 1.48 (s, 3 H), 1.27 (d, J = 2.0 Hz, 3 H). c) [Bis-(4-methoxy-phenyl)-phenyl-methyl]-[(R)—4-(6-bromofluoro-pyridin-Z-yI)-5,5- difluoro-4,6,6-trimethyI-5,6-dihydro-4H-[1,3]oxazinyl1-amine To a solution of (R)—4-(6—bromofluoro—pyridinyl)—5,5-difluoro-4,6,6-trimethyl-5,6-dihydro-4H- [1,3]oxazinylamine (106 mg, 0.301 mmol) and triethylamine (60.9 mg, 0.602 mmol) in dichloromethane (3 ml) was added solid 4,4’-dimethoxytrityl de (112 mg, 0.331 mmol) under argon here. The green solution was stirred at rt for 2 hrs and was then evaporated in vacuo. The crude product was taken up with ethyl acetate and washed with aqueous sodium bicarbonate solution, water and brine. The organic phase was dried over sodium sulfate, filtered and evaporated. Filtration over silica gel (4.4 g, toluene/ethyl acetate 6:4) afforded the title nd as a blue—gray foam (202 mg, 96 %).

TLC (toluener‘ethyl acetate 6:4, silica gel, UV 254): Rf = 0.60; LC—MS: Rtm = 1.22 min; (94 % pure; ESl+—MS: m/z 654 +]; 656); 1H-NMR (400MHz ,DMSO-de) 6 = 7.72 - 7.61 (m, 2 H), 7.32 - 7.13 (m, 9 H), 6.84 — 6.77 (m, 4 H), 6.71 (br. s, 1H), 3.71 (s, 6 H), 1.16 (br. s, 3H), 1.12 (br. s, 3H), 1.07 (br. s, 3 H). d) 3-Chlorocyano-pyridinecarboxylic acid ){[bis-(4-methoxy-phenyl)-phenyl- methyl]-amino}-5,5-dif|uoro-4,6,6-trimethyl-5,6-dihydro-4H-[1,3]oxazinyl)fluoro- pyridinyl]-amide A degassed e of [bis-(4-methoxy—phenyl)-pheny|-methyl]-[(R)—4-(6-bromo—3-fluoro—pyridin- 2-yl)—5,5-difluoro—4,6,6-trimethyl-5,6-dihydro—4H-[1,3]oxazinyI]-amine (196 mg, 0.299 mmol), -cyanomethyl-pyridinecarboxylic acid amide (59.8 mg, 0.329 mmol), Xantphos (62.4 mg, 0.108 mmol), caesium carbonate (139 mg, 0.419 mmol) and Pd2(dba)3 (33.9 mg, 0.036 mmol) was heated under argon in dioxane (6 ml) at 60 °C for 20 hours. The reaction mixture was diluted with ethyl e and aq. bicarbonate solution and was then filtered through hyflo. The filtrate was washed with water and brine, dried over sodium sulfate, filtered and evaporated to give 226 mg yellowish foam. The crude product was chromatographed over silica gel (toluene/ethyl acetate 8:2) to give the title compound as a light yellow foam. 92 mg (38.6 % yield).

LC—MS: Rtm = 1.20 min (95 % pure; S: 755, [(M+H)*];756, 757, 758); 1H-NMR (400MHz ,CDCI3): 6 10.24 (br. s, 1 NH), 8.74 (br. d, 1 H), 8.36 (dd, 1 H), 8.21 (d, J: 1.8 Hz, 1 H), 7.50 (dd, 1 H), 7.42 - 6.79 (m, 13 H + 1NH), 3.79 (s, 6 H), 1.60 (br. s, 3 H), 0.89 (br. s, 3 H), 0.78 (br. s, 3 H). e) 3-Chlorocyano-pyridinecarboxylic acid [6-((R)amino-5,5-difluoro-4,6,6-trimethyl- ,6-dihydro-4H-[1 ,3]oxazinyl)fluoro-pyridin-Z-y11-amide A solution of 3-chlorocyano-pyridine-Z-carboxylic acid [6-((R)-2~{[bis-(4-methoxy-phenyl)- phenyI-methyI]-amino}-5,5-difluoro—4,6,6-trimethyl-5,6-dihydro-4H-[1 ,3]oxazinyl)—5-fluoro- pyridin-2—yl]—amide (85 mg, 0.113 mmol), TFA (572 pl, 7.43 mmol) and triethylsilane (54 pl, 0.338 mmol) in dichloromethane (1.1 ml) was stirred at rt for 24 hours. The reaction mixture was evaporated and the residue d with ethyl acetate, washed with water and brine, dried over sodium e, filtered and evaporated to give 119 mg brown—yellowish resin. The product was chromatographed over silica gel (RediSep 12 g, conditioned with ethyl acetate/methanol 95:5 and eluted with ethyl acetate) to give the title compound as a light yellow solid. 38 mg (74.6 % yield).

TLC (ethyl acetate/methanol 95:5, silica gel, UV 254): R = 0.29; LC-MS: RtH1 = 0.76 min (100 % pure; ESl+-MS: 453. [(M+H)*], 455); 1H-NMR (400MHz ,cocrs): 6 1266 (very br. s, 1 NH), 12.03 (br. s, 1 NH), 10.29 (br. s, 1 NH), 8.87 (d, J: 1.8 Hz, 1 H), 8.49 (dd, 1 H), 8.18 (d, J: 1.8 Hz, 1 H), 7.62 (dd, 1 H), 5.74 (br. 3,1 NH), 2.01 (d, J: 2.3 Hz, 3 H), 1.74 (s, 3 H), 1.44 (d, J= 2.3 Hz, 3 H).

Example 4: 5-Cyanomethyl-pyridinecarboxylic acid {6-[(R)amino-5,5-difluoro(2- methoxy-ethyl)-5,6-dihydro-4H-[1,3]oxazinyl]fluoro-pyridinyl}-amide a) 1-(6-Bromofluorotriethylsilanyl-pyridinyl)methoxy-propanone To a solution of 1-(6—bromof|uoro—4—triethylsilanyl-pyridinyl)-ethanone (11.6 g, 33.9 mmol, example 1, step b) in dichloromethane (50 ml) was added —base (6.21 mi, 35.6 mmol) at 0 °C followed by TMS-triflate (6.43 ml, 35.52 mmol, 1.05 eq.) under nitrogen. The reaction mixture was stirred at 0 °C for 40 minutes. Dimethoxymethane (2.71 g, 35.6 mmol) and 2,6—di-tert- yridine (0.648 g, 3.39 mmol) was added drop wise at 0 °C. TMS—triflate (0.61 ml, 3.39 mmol) was then added to the reaction mixture. After 30 min the cooling bath was d and stirring was continued at rt over night (18 h). The reaction mixture was poured onto cold brine, diluted with ethyl acetate and the organic phase was washed thoroughly with 10% NaHSO4 solution, set. sodium bicarbonate soiution (saturated with NaCl) and brine, dried over sodium sulfate, filtered and evaporated. The crude product (1352 g) was tographed over silica gel (320 g, cyclohexane/ethyl acetate 95:5) to give the title compound as a yellow liquid: 9.18 g (72 % yield).

TLC (cyclohexane/ethyl acetate 5:1): R = 0.61; LC-MS: Rtm = 1.43 min (100 % pure; ESI+~MS: 376, [(M+H)*], 378); 1H—NMR (400 MHz, CDCI3): 5 7.58 (d, J = 2.9 Hz, 1 H), 3.83 (1, J = 5.2 Hz, 2 H), 3.41 (t, J = 6.2 Hz, 2 H), 3.39 (s, 3H), 1.06 - 0.82 (m, 15 H). b) MethyI-propanesulfinic acid [1-(6-bromofluorotriethylsilanyl-pyridinyl)- 3-methoxy-prop-(E)-ylideneJ-amide A mixture of titantetraethoxide (11.03 g, 48.4 mmol), (S)—tert.-butylsu|finamide (3.52 g, 29 mmol) and 1—(6-Bromo—3—fluoro~4~triethylsilanyl-pyridin—2—yl)—3~methoxy~propanone (9.1 g, 24.18 mmol) in THF (100 ml) was stirred at 60 °C under a nitrogen atmosphere for 34 hours. The cold reaction mixture was diluted with ethyl acetate and poured onto icecold brine (200 mi) with gentle stirring. The precipitate was filtered through a pad of hyflo and and washed with ethyl acetate. The e was diluted with ethyl acetate and washed with brine, dried over sodium sulfate, filtered and evaporated. The crude ish-brown oil (10.67 g) was chromatographed over silica gel ep column 120 g, cyclohexane/ethyl acetate 95:5) to give the title compound as a yellow-orange oil. 7.51 g (63.5 % yield).

TLC (cyclohexane/ethyl acetate 10:1): R: = 0.23; LC-MS: Rtm = 1.53 min (98 %, ESI+~MS: m/z 479 [(M+H)+, 1Br], 481). c) (R)(6-Bromofluorotriethylsilanyl-pyridinyl)-2,2-difluoromethoxy((S)—2- methyl-propane-Z-sulfinylamino)-pentanoic acid ethyl ester To a suspension of zinc (3.07 g, 47 mmol) and copper(l) de (233 mg, 2.349 mmol) in dry THF (90 ml) were added 4 drops of trimethylchlorosilane under nitrogen to activate the zinc.

After 10 minutes ethyl 2-bromo-2,2-difluoroacetate (9.54 g, 47 mmol) was added slowly by syringe over a period of 20 minutes between 25 ° and 30 °C adjusted with an external cooling bath (exothermic). The reaction mixture was kept in an ultrasound bath for 30 minutes. This black fine suspension was added drop wise to a solution of (S)—2-methyl-propane—2-sulfinic acid [1-(6-bromofluoro—4-triethylsilanyl-pyridinyl)—3—methoxy—prop-(E)—ylidene]-amide (7.51 g, .66 mmol) in dry THF (75 ml) at 0 °C under inert atmosphere. After 15 min the on mixture was kept at 50 °C for 2 h and was then added to a cold aq. ammonium chloride solution (5 %). Ethyl e was added and the organic phase was washed with aq. citric acid (5% solution), water, sat. sodium bicarbonate solution and brine, dried over sodium e, filtered and concentrated. The crude ish oil (9.77 g, roughly a 4:1 mixture of diastereoisomers) was chromatographed over silica gel (Redisep column 120 g, exane/ethyl acetate 85:15) to give the title compound as a yellow oil. 6.11 9 yellow oil. (64.6 % .

TLC (cyclohexane/ethyl acetate 2:1 ): Rf = 0.47; LC-MS: Rtm = 1.54 min (100 %, ESI+~MSz m/z 604 [(M+H)+, 1Br], 606); 1H-NMR (400 MHz, 00013): 6 7.45 (d, J = 2.5 Hz, 1 H), 6.63 (br. s, 1 H), 4.22 - 4.04 (m, 2 H), 3.77 - 3.68 (m, 1 H), 3.31 - 3.20 (m, 1 H), 3.15 (s, 3 H), 3.11 - 3.00 (m, 1 H), 2.97 - 2.84 (m, 1 H), 1.35 (s, 9 H), 1.15 (t, J = 7.2 Hz, 3 H), 1.04 — 0.95 (m, 9 H), 0.94 - 0.83 (m, 6 H).

The minor diastereoisomer R = 0.35 (2:1 cyclohexane1ethyl acetate was not isolated. d) (R)(6-Bromofluoro-pyridinyl)-2,2-difluoromethoxy((S)methyl-propane-Z- sulfinylamino)-pentanoic acid ethyl ester Freshly ground KF (1.174 20.21 mmol) was added to a solution of (R)—3-(6—bromofluoro triethylsilanyl-pyridinyl)-2,2-difluoromethoxy—3-((S)methyl-propanesulfinylamino)- pentanoic acid ethyl ester (6.10 g, 10.11 mmol) and acetic acid (1.157 ml, 20.21 mmol) in THF (39.8 ml). DMF (39.8 ml) was added and the suspension was stirred at rt. After 6 h the reaction mixture was diluted with ethyl acetate and washed with sat. sodium bicarbonate solution and brine, dried over sodium sulfate, filtered and evaporated. The crude product (4.85 g, 98 % yield) was used without purification in the next step.

TLC (cyclohexane/ethyl acetate 1:1): Rf = 0.33; LC-MS: Rtm = 1.11 min (100 %, ESI+-MS: m/z 489 ”, 1Br], 491); 1H-NMR (400 MHz, CDCl3): 6 7.56 - 7.48 (m, 1 H), 7.41 - 7.30 (m, 1 H), 6.54 (br. s, 1 H), 4.25 - 4.05 (m, 2 H), 3.77 — 3.64 (m, 1 H), 3.34 - 3.22 (m, 1 H), 3.15 (s, 3 H), 3.03 - 2.97 (m, 1 H), 2.94 - 2.86 (m, 1 H), 1.34 (s, 9 H), 1.18 (1, J: 7.3 Hz, 3 H). e) (S)Methyl-propanesulfinic acid [(R)(6-bromofluoro-pyridinyl)-2,2-difluoro- 3-hydroxy(2-methoxy-ethy|)-propyl]-amide To a solution of (R)—3-(6-bromofluoro-pyridinyl)-2,2-difluoromethoxy((S)methyl- propane-Z-sulfinylamino)-pentanoic acid ethyl ester (2.4 g, 4.90 mmol) in THF (38 ml) was added lithiumborohydride (214 mg, 9.81 mmol) in 2 ns. The slightly exothermic reaction PCT/lBZOlZ/054269 was stirred for 6 hours at room temperature. Crushed ice was added carefully and the reaction mixture was diluted with ethyl e. The organic phase was washed with water and brine, dried over sodium sulfate, filtered and evaporated. The crude ish resin (2.05 g) was chromatographed over silica gel (Redisep column 40 g, exane/ethyl acetate 4:6) to give the title compound as a colourless resin. 1.50 g (68.4 % yield).

TLC (cyclohexane/ethyl acetate 1:1): R: = 0.13; LC—MS: Rtm = 0.84 min (100 %, ESI+—MS: m/z 447 [(M+H)“, 1Br], 449); 1H-NMR (400 MHz, 00013): 6 7.55 - 7.45 (m, 1 H), 7.37 — 7.29 (m, 1 H), 6.34 - 6.25 (br. s, 1 H), 3.95 - 3.63 (m, 2+1 H), 3.40 - 3.27 (m, 1 H), 3.18 (s, 3 H), 3.05 — 2.94 (m, 1 H), 2.84 - 2.73 (m, 1 H), 2.19-2.11 (m, 1 H, OH), 1.35 (s, 9 H). f) (R)Amino(6-bromofluoro-pyridinyI)-2,2-difluoromethoxy-pentanol To a solution of (S)methyI-propane—2-sulfinic acid [(R)—1—(6-bromofluoro-pyridinyl)—2,2- difluorohydroxy—1-(2-methoxy—ethyl)-propyl]-amide (1.50 g, 3.33 mmol) in methanol (8.4 ml) was added 2M HCI in diethyl ether (6.56 ml, 13.11 mmol). The reaction mixture was stirred for 1.5 h at room temperature. 7 M ammonia in methanol (2.7 ml) was added to the reaction mixture and the resulting colourless suspension was evaporated in vacuo. The remaining solid was triturated with warm dichloromethane, cooled to rt, filtered and rinsed with dichloromethane. The filtrate was evaporated ing the title compound which was used without purification in the next step. 1.42 g colourless, viscous oil. 100 % yield.

TLC hexane/ethyl e 4:6): R = 0.41; LC-MS: Rtm = 0.52 min (100 %, ESl+-MS: m/z 343 [(M+H)*, 1Br], 345); 1H-NMR (400 MHz, CDCl3): 6 7.52 (dd, J = 3.1, 3.4 Hz, 1 H), 7.34 (dd, J = 8.4, 9.9 Hz, 1 H), 4.23 — 4.06 (m, 1 H), 3.31 (s, 1 H + OH), 3.66 - 3.56 (m, 1 H), 3.30 — 3.21 (m, 1 H), 3.17 (s, 3 H), 2.77 -2.66 (m, 1 H), 2.57-2.43 (m, 1 H). g) N-[(R)(6-Bromofluoro-pyridiny|)-5,5-difluoro(2-methoxy-ethyl)-5,6-dihydro- 4H-[1,3]oxazinyl]nitro-benzamide To a on of (R)amino(6-bromofluoro-pyridinyl)—2,2-difluoromethoxy—pentan—1-ol (1.15 g, 3.35 mmol) in THF (27.9 ml) was added nitrobenzoyl-isothiocyanate (767 mg,3.69 mmol). After stirring at rt for 4 hr DCC (760 mg, 3.69 mmol) and triethylamine (34.1 mg, 0.337 mmol) was added. Stirring was continued at rt for 19 hr and finally, the reaction mixture was kept at 70 °C for 5 h. The yellow-orange solution was cooled and evaporated in vacuo. The crude product (2.7 g) was chromatographed over silica gel (Redisep column 120 g, cyclohexane/ethyl acetate 7:3) to give the title compound as a light yellow foam. 650 mg (35.6 % .

TLC (cyclohexane/ethyl acetate 7:3): R: = 0.17; LC—MS: Rtm = 1.15 min (95 %, ESl+-MS: m/z 517 [(M+H)+, tBr], 519); 1H-NMR (400 MHz, CDCl3): 6 12.07 (br. s, 1 H), 8.49 (d, J = 9.0 Hz, 2 H), 8.29 (d, J = 8.9 Hz, 2 H), 7.68-7.58 (m, 1 H), 7.49- 7.40 (m, 1 H), 4.59—4.42 (m, 1 H), 4.35- 4.19 (m, 1 H), 3.87- 3.72 (m, 1 H), 3.54-3.39 (m, 1 H), 3.35 (s, 3 H), 3.02 -2.88 (m, 1 H), 2.71 -2.57 (m, 1 H). h) (R)(6-Bromofluoro-pyridinyl)-5,5-difluoro(2-methoxy-ethyl)-5,6-dihydro-4H- [1 zinylamine A suspension of N—[(R)—4—(6—bromofluoro-pyridinyl)—5,5-difluoro(2-methoxy—ethyl)-5,6- dihydro-4H[1,3]oxazin-2—yl]-4~nitro-benzamide (640 mg, 1.237 mmol) and potassium carbonate (513 mg, 3.71 mmol) in methanol (18.7 ml) was stirred for 22 h at rt. The resulting yellow solution was evaporated, diluted with ethyl acetate and washed with water and brine, dried over sodium sulfate, filtered and evaporated. 400 mg yellow solid (88 % yield). The crude product was used in the next step without ation.

TLC (cyclohexane/ethyl acetate 1:1): Rf = 0.14; LC-MS: Rtm = 0.59 min (100 %, ESl+~MSz m/z 368 [(M+H)+, 1Br], 370); 1H-NMR (400 MHz, : 0 7.53 - 7.43 (m, 1 H), 7.28 (s, 1 H), 4.35 - 4.18 (m, 1 H), 4.14 - 4.01 (m, 1 H), 3.71 — 3.62 (m, 1 H), 3.53 - 3.40 (m, 1 H), 3.30 (s, 3 H), 3.26 - 3.10 (m, 1 H), 3.05 - 2.93 (m, 1 H), 2.32 - 2.14 (br. s, 1 H, NH), 1.77 — 1.47 (br. s, 2 H, NH plus res. water). i) [Bis-(4-methoxy-phenyl)-phenyl-methyl]-[(R)—4-(6-bromofluoro-pyridinyl)-5,5- difluoro(2-methoxy-ethyl)-5,6-dihydro-4H-[1,3]0xazinyl]-amine To a solution of (R)(6—bromofluoro—pyridin—2-yl)—5,5—difluoro(2-methoxy—ethyl)-5,6- dihydro-4H-[1,3]oxazinylamine (200 mg, 0.543 mmol) and triethylamine (110 mg, 1.087 mmol) in romethane (5.4 ml) was added solid imethoxytrityl chloride (202 mg, 0.598 mmol) under argon atmosphere. The green solution was stirred at rt for 16 hrs and was then evaporated in vacuo. The crude product was taken up with ethyl acetate and washed with aqueous citric acid, aqueous sodium onate solution, water and brine. The organic phase was dried over sodium sulfate, filtered and evaporated. The crude product (380 mg) was chromatographed over silica gel (Redisep column 12 g, cyclohexane/ethyl e 8:2) to give the title compound as a colourless foam. 339 mg (93 % yield).

TLC (cyclohexane/ethyl acetate 8:2): R: = 0.29; LC-MS: Rtm = 1.23 min (100 %, ESl+-MS: m/z 670 [(M+H)+, 1Br], 672); 1H—NMR (400 MHz, : 6 7.49 - 7.16 (m, 11 H), 6.87 - 6.78 (m, 4 H), 5.41 - 5.28 (m, 1 H), 3.87 - 3.59 (m, 9 H), 3.97 (m, 4 H), 2.99 - 2.85 (m, 1 H), 2.74 - 2.60 (m, 1 H). j) 5-Cyanomethyl-pyridinecarboxylic acid {6-[(R){[bis-(4-methoxy-pheny|)-phenyl- methyl]-amino}-5,5-difluoro(2-methoxy-ethyl)-5,6-dihydro-4H-[1,3]oxazinyl]fluoro- pyridin-Z-yl}-amide A degassed mixture of [bis-(4-methoxy—phenyl)-phenyl-methyl]-[(R)—4-(6-bromofluoro-pyridin- 2-yl)-5,5-difluoro(2-methoxy—ethyl)-5,6-dihydro—4H-[1,3]oxazinyl]—amine (330 mg, 0.492 mmol), 5-cyano—3-methyI-pyridine—2-carboxylic acid amide (95 mg, 0.591 mmol), rac-trans-N,N‘- ylcyclohexane-1,2-diamine (21.65 mg, 0.148 mmol), potassium carbonate (150 mg, 1.083 mmol) and copper iodide (28.1 mg, 0.148 mmol) was refluxed under argon in dioxane (12.3 ml) for 20 hrs. The reaction mixture was evaporated, taken up in ethyl acetate and washed with aqueous sodium bicarbonate solution, water and brine, dried over sodium e, d and evaporated to give 406 mg red-brown foam. The crude product was chromatographed over silica gel (Redisep column 129, toluene/ethyl acetate 8:2) to give the title compound as a pinky foam. 152 mg (37.4 % yield).

TLC (toluene/ethyl acetate 8:2): Rf = 0.37; LC-MS: Rtm = 1.22 min (91 % pure; ESl+~MS: 751). k) 5-Cyanomethyl-pyridinecarboxylic acid {6-[(R)amino-5,5-difluoro(2-methoxy- ethyl)-5,6-dihydro-4H-[1,3]oxazinyl]fluoro-pyridin-Z-yl}-amide A solution of omethyl-pyridine—2-carboxylic acid {6-[(R){[bis-(4-methoxy—phenyl)- phenyl-methyl]-amino}-5,5-difluoro(2-methoxy-ethyl)-5,6-dihyd ro-4 H-[1 ,3]oxazinyl]—5-fluoro- pyridinyl}-amide (146 mg, 0.194 mmol), TFA (0.989 mi, 1283 mmol) and triethylsilane (0.093 ml, 0.583 mmol) in dichloromethane (1.9 ml) was stirred at rt for 18 hours. The reaction mixture 2012/054269 was evaporated and the residue diluted with ethyl acetate, washed with sat. aqueous sodium bicarbonate solution, water and brine, dried over sodium sulfate, filtered and evaporated. 142 mg colourless resin. The product was chromatographed over a preparative silica gel plate (2 mm, 20x20 cm, Merck, dichloromethane/methanol 95:5) to give the title compound as a colourless foam. 74 mg (85 % yield).

TLC (dichloromethane/methanol 95:5, silica gel, UV 254): R: = 0.28; LC-MS; Rtm = 0.76 min (100 % pure; ESI+~MSz 449 [(M+H)*]); 1H-NMR (400 MHz, DMSO—de): 5 = 10.70 (br. s, 1 H, NH), 9.00 (br. s, 1 H), 8.45 (br. s, 1 H), 8.30 - 8.13 (m, 1 H), 7.84 - 7.88 (m, 1 H), 5.88 (br. s, 3 H), 4.45 — 4.25 (m, 1 H), 4.19 - 4.00 (m, 1 H), 3.82 — 3.44 (m, 1 H), 3.27 - 8.18 (m, 1 H), 3.18 (s, 3 H), 2.98 — 2.83 (m, 1 H), 2.81 (s, 3 H), 2.00 - 1.88 (m, 1 H). es 5-6: The compounds listed in Table 3 were prepared by a procedure analogous to that used in Example 4. r, for Example 5 (R)—tert.-butylsulfinamide was used to form the sulfoximine in step 4b.

Compound 1H-NMR (solvent; 8) (400 MHz, 00013): 8 .89 (br. s, 1H), 8.92 - 8.82 (m, 1H), 8.55 - 8.48 (m, 1H), 7.98 - 7.87 (m, 1H), 7.88 - 7.58 (m, 1H), 4.61 — 4.45 (m, 1H), 4.31 - -Cyanomethyl-pyridine—2-carboxylic acid 4.17 (m, 1H), 3.85 - {6-[(S)amino-5,5-difluoro—4—(2-methoxy- 3.58 (m, 2H), 3.32 (s, ethyl )-5,6-dihyd ro-4H-[1 ,3]oxazinyl]—5- 3H), 3.01 - 2.88 (m, fluoro-pyridinyl}-amide 1H), 2.81 (s, 8H), 2.58 — 2.43 (m, 1H) Example nd 1H-NMR (solvent; 6) (400 MHz, CDCI3): 3 .47 (br. s, 1H), 8.82 (s, 1H), 8.41 (dd, 1H), 8.06 (s, 1H), 7.49 (t, 1H), 4.25-4.33 (d, 1H), 3.97 - 4.20 (m, 3-Chloro—5—trifluoromethyl-pyridine-Z- 1H), 3.42 - 3.56 (m, carboxylic acid {6-[(R)—2-amino-5,5—difluoro- 2H), 3.19 (s, 3H). 4-(2-methoxy—ethyl)-5,6-dihyd ro-4H- 2.78 - 2.92 (m, 1H), [1 ,3]oxazinyl]—5~fluoro-pyridin-Z-yl}-amide 2.15-2.31 (m, 1H) Examgle 7: 3-Chlorotrifluoromethyl-pyridinecarboxylic acid [6-((R)amino-5,5- difluoromethyl-5,6-dihydro-4H-[1,3]oxazinyl)fluoro-pyridinyl]-amide a) [Bis-(4-methoxy-phenyl)-phenyl-methyl]-[(R)—4-(6-bromofluoro-pyridin-Z-yI)-5,5- dlfluoromethyl-5,6-dihydro-4H-{1,3]oxazinyl]-amine (R)-4~(6—bromo—3—fluoro—pyridin-Z-yl)—5,5-difluoromethyl-5,6—dihydro-4H—{1 zine—2— ylamine (5 g, 15.43 mmol, Example 1 intermediate h) was dissolved in DCM (154 ml) under argon, triethylamine (4.30 mL, 30.9 mmol) and 4,4’-dimethoxytrityl chloride (5.75 g, 16.97 mmol) were added and the reaction e was stirred at rt for 18 hours. The solvent was d in vacuo and the residue was taken up in ethyl acetate. The organic layer was washed with aq % citric acid, water, aqueous saturated sodium bicarbonate solution and brine, dried over sodium sulfate, filtered and concentrated. The crude product was chromatographed over silica gel (Redisep column 120 g, cyclohexane/ethyl) to give the title compound: 8.16 g (69.2 % yield).

TLC (cyclohexane/ethyl acetate 3:1, silica gel, UV 254): R: = 0.45; ZOIZ/054269 LC-MS: RtHg = 1.37 min; (ESI+—MS: m/z 626 [(M+H)+ ,1Br]; 628); 1H-NMR (400 MHz, DMSO-de): 6 7.71 (dd, 1 H), 7.64 (dd, 1 H), 7.32 - 7.08 (m, 9 H), 6.86 (s, 1H), 6.81-6.77 (m, 4 H), .05 (m, 1 H), 4.02-3.98 (m, 1 H), 3.71 (s, 6 H), 1.05 (br. s., 3 b) [(R)(6-Aminofluoro-pyridiny|)-5,5-difluoromethyl-5,6-dihydro-4H-[1,3]oxazin- [bis-(4-methoxy-pheny|)-phenyl-methy|]-amine To a solution of [bis-(4-methoxy-phenyl)-phenyI-methyl]—[(R)(6—bromofluoro—pyridin-Z-yl)- ,5-difluoromethyl-5,6~dihydro-4H-[1,3]oxazin—2-yl1-amine (23.4 g, 28.8 mmol) in ammonia (173 ml, 1.21 mol, 7M in methanol) in a microwave vial was added ethylene glycol (240 mi) and methanol (240 ml). Copper oxide Cuzo (1.21 g, 8.46 mmol) was added and the vial was sealed.

The reaction mixture was stirred at 80 °C for 43 hours. The cold reaction mixture was diluted with ethyl acetate and washed with water, s ammonia and brine. The organic layer was dried over sodium e, filtered and evaporated. The crude product was chromatographed over silica gel (400 g, dichloromethane/methanol 98:2 + 0.2 % ammonia) to give the title compound: 4.299 (25 % yield).

TLC (dichloromethane/methanol 95:5 + 0.5 % ammonia, silica gel, UV 254): R = 0.29; LC-MS: RtHz = 1.03 min; (ESl+-MS: m/z 563 [(M+H)*]); ‘H-NMR (400 MHz, DMSO-ds): 6 7.25 - 7.32 (m, 2 H) 7.10 - 7.24 (m, 8 H) 6.77 (d, 4 H) 6.59 (s, 1 H) 6.41 (dd, 1 H) 5.77 (d, 2 H) 4.09 - 4.22 (m, 1 H) 3.91 — 4.01 (m, 1 H) 3.70 (s, 6 H) 0.97 (br. s., 3 H). c) 3-Chloro-S-trifluoromethyl-pyridinecarboxylic acid [6-((R)-5,5-difluoro{[(4- methoxy-phenyI)-(3-methoxy-phenyl)-phenyl-methyl]-amino}-4—methyl-5,6-dihydro-4H- [1 ,3]oxazinyl)f|uoro-pyridinyl]-amide [(R)—4-(6-aminofluoro-pyridin-2—yl)-5,5-difluoro—4—methyl-5,6—dihydro-4H—[1,3]oxazinyl]—[bis~ (4-methoxy-phenyl)-phenyl-methyl]-amine (250 mg, 0.444 mmol), 3-chIoro(trifluoromethyl)— picolinic acid (120 mg, 0.533 mmol) and HOAt (109 mg, 0.800 mmol) were dissolved in DMF (4.44 ml) under argon. EDCxHCl (128 mg, 0.667 mmol) was added and the reaction mixture was stirred at rt for 18 hours. The reaction mixture was diluted with ethyl acetate, washed with water and brine, dried over sodium sulfate, filtered and concentrated. The crude product was PCT/132012/054269 chromatographed over silica gel (Redisep column 12 g, cyclohexane/ethyl acetate) to give the title nd: 100 mg (29.2 % yield).

LC—MS: RtHz = 1.43 min; (96 % purity; ESl+-MS: m/z 770 [(M+H)+,1Cl]; 772); . 1H-NMR (400 MHz, DMSO'de):811.22 (s, 1 H), 9.08 (s, 1 H), 8.72 (s, 1 H), 8.16 (dd, 1 H), 7.71 (dd, 1 H), 7.30 - 7.24 (m, 2 H), 7.23 - 7.10 (m, 7 H), 6.81 - 6.74 (m, 5 H), 4.33-4.23 (m, 1 H), 4.08-4.00 (m, 1 H), 3.70 (s, 6 H), 1.06 (br. s, 3 H). d) 3-Chlorotrifluoromethyl-pyridinecarboxylic acid [6-((R)amino-5,5-difluoro methyl-5,6-dihydro-4H-[1,3]oxazinyl)fluoro-pyridinyl]-amide rotrifluoromethyI-pyridinecarboxylic acid [6-((R)—5,5-difluoro{[(4-methoxy—phenyl)— (3-methoxy-phenyl)-pheny|-methyl]—amino}methyl-5,6—dihydro-4H—{1,3]oxazinyl)—5—fluoro- pyridinyl]-amide (80 mg, 0.104 mmol) was dissolved in dichloromethane (0.1039 ml), TFA (80.0 pl, 1.04 mmol) was added and the reaction mixture was stirred at rt for 18 hours. The reaction mixture was poured onto a mixture of ice ethyl acetate and NH4OH (w=25%). The organic layer was washed with water, brine, dried over sodium sulfate, filtered and concentrated.

The crude product was tographed over silica gel (column 4 g, dichloromethane/methanol 95:5 + 0.5 % ammonia) to give the title compound: 32 mg (65.9 % yield).

LC-MS: Rtm = 0.79 min; (100 % purity; S1 m/z 468 [(M+H)+,1Cl]; 470); ‘H-NMR (400 CI3):81O.21 (br. s, 1 H), 8.86 (d, 1 H), 8.40 (dd, 1 H), 8.17 (d, 1 H), 7.53 (dd, 1 H), 4.21 - 4.13 (m, 4 H), 1.83 (t, 3 H).

Example 7a: Alternative synthesis of 3-chlorotrifluoromethyl-pyridinecarboxylic acid [6-((R)amino-5,5-difluoromethyl-5,6-dihydro-4H-[1,3]oxazinyl)fluoro-pyridin yl]-amide a) (R)(6-Bromofluoro-pyridinyl)-5,5-difluoromethyl-5,6-dihydro-4H-[1,3]oxazin ylamine The (+)-campher sulfonic acid salt of (R)—3-amino(6-bromofluoro-pyridin-2—yl)—2,2—difluoro- butanol (12.75 g, 23.99 mmol) was partitioned between TBME and aq. N32003 (w=10%), the layers were separated, the aq. layer was extracted with TBME, the organic layer was extracted with set. aq. NaCl. The ed organic layers were dried with Na2C03, the solvent evaporated to yield the free base as white crystals.

To a solution of (R)amino(6-bromofluoro-pyridinyl)-2,2-difluoro-butanol (9.49 g, 31.7 mmol) in EtOH (256 ml) was added NaHCOs (1.066 g, 12.69 mmol) and cyanogen e (10.08 g, 95 mmol) and the mixture was warmed to 85 °C over night. After g to rt the solvent was evaporated and the residue taken up in 1N HCl and TBME, the layers were separated and the organic layer was washed with 1N HCl. The aq. layers were combined, basified by on of solid Na2C03 and extracted with TBME (2x). The ed TBME extracts were washed with sat. aq. NaCl, dried with K2003 to provide the desired product as yellow resin. This material was used for the next step without further purification.

HPLC: RtH5= 2.716 min; ESIMS [NH-Hr: 3240/3260; 1H-NMR (600 MHz, DMSO-ds): 6 7.75 - 7.59 (m, 2H), 5.85 (s, 2H), 4.43 - 4.30 (m, 1H), 4.24 — 4.10 (m, 1H), 1,63 (br. s, 3H). b) (R)(6-Aminofluoro-pyridin-Z-yl)-5,5-difluoro-4—methyl-5,6-dihydro-4H-[1,3]oxazin ylamine To a solution of (R)(6-bromo—3—fluoro-pyridin-2—yl)-5,5-difluoro-4—methyl-5,6-dihydro-4H- [1,3]oxazinylamine (8.73 g, 23.17 mmol) in ethylene glycol (139 ml) and aq. NH3 (w=25%, 108 ml) in an autoclave was added copper(|) oxide (497 mg, 3.47 mmol) and the mixture was warmed to 60 °C over night. After cooling to rt the mixture was extracted with EtOAc, the organic layer was washed with aq. NH3 , 2x), the combined organic layers were washed with sat. aq. NaCl, dried with Na2804 and evaporated. The e was dissolved in TBME and extracted with 1N HCl (2x). The combined aq. layers were basified by addition of solid NEQCO3 some NaCI was added and the aq. solution extracted with DCM (4x). The combined DCM extracts were dried with K2003 and evaporated to provide the title compound as greyish resin.

The crude material was used for the next step without further purification.

HPLC: RtH5= 2.584 min; ESIMS [M+H]+ = 251.0; 1H-NMR (600 MHz, DMSO—ds): 5 7.23 (dd, 1H), 6.40 (dd, 1H), 5.77 (s, 2H), 5.53 (s, 2H), 4.29 — 4.15 (m, 2H), 1.55 (s, 3H). c) -(6-Aminofluoro-pyridinyl)-5,5-difluoromethyl-5,6-dihydro-4H-[1,3]oxazin- 2-yl]-carbamic acid tert-butyl ester To a on of (R)—4-(6-aminofluoro-pyridinyl)-5,5-difluoro-4—methyl-5,6-dihydro-4H— [1,3]oxazinylamine (4.53 g, 17.41 mmol) in DCM (46 ml) was added DIPEA (4.26 ml, 24.37 mmol) and Bocgo (4.56 g, 20.89 mmol) and the mixture was warmed to 40 °C over night. The solvent was evaporated (at 34 °C) and the residue was purified by chromatography on silica gel (cyclohexane / [EtOAc/MeOH 95:5] 4:1 to 1:1) to provide the title compound as colorless foam.

WO 27188 HPLC: RtH5= 3.001 min; ESIMS [M+H]+ = 361.2; 1H-NMR (600 MHz, coolg): 5 7.26 (t, 1H), 6.51 (d, 1H), 4.51 (br. s, 2H), 4.40 - 4.29 (m, 2H), 1.91 (s, 3H), 1.52 (s, 9H). d) ((R){6-[(3-Chlorotrifluoromethyl-pyridinecarbonyl)—amino]fluoro-pyridinyl}- ,5-difluoromethyl-5,6-dihydro-4H-[1,3]oxazinyl)-carbamic acid tert-butyl ester To a solution of [(R)—4—(6-amino—3—fluoro—pyridin—2—yl)—5,5~difluoro~4-methyl-5,6-dihydro-4H- [1 ,3]oxazin—2—yl]—carbamic acid tert—butyl ester (134 mg, 0.372 mmol) in DMF (1.3 ml) was added 3-chlorotrifluoromethyl—pyridine—2—carboxylic acid (101 mg, 0.446 mmol) and HOAt (91 mg, 0.669 mmol). The mixture was cooled to 0 °C, EDC*HC| (107 mg, 0.558) was added and the mixture stirred for 1 h while allowing to warm to rt. To the on e was added TBME and water, the layers were separated and the aq. layer extracted with TBME. The combined organic layers were washed with sat. aq. NaHC03, sat. aq. NaCl, dried with MgSO4 and evaporated. The residue was purified by chromatography on silica gel (cyclohexane/ EtOAc 6:1 to 5:1) to provide the title compound as colorless solid.

HPLC: R1,”: 2.920 min; ESIMS [M+H]+ = 5680/5700; 1H-NMR (600 MHz, DMSO-de): 6 11.25 (s, 1H), 9.65 (s, 1H), 9.08 (br. s, 1H), 8.72 (br. s, 1H), 8.23 (d, 1H), 7.83 (t, 1H), 4.57 - 4.41 (m, 2H), 1.72 (s, 3H), 1.40 (s, 9H). e) 3-Chlorotrifluoromethyl-pyridinecarboxylic acid [6-((R)amino-5,5-difluoro methyl-5,6-dihydro-4H-[1,3]oxazinyl)—5-fluoro-pyridin-Z-yl]-amide To a on of ((R)—4-{6-[(3—chloro~5—trifluoromethyl-pyridinecarbonyl)~amino]fl uoro— pyridin~2—yl}-5,5—difluoro-4—methyl-5,6-dihydro-4H-[1,3]oxazinyl)—carbamic acid tert—butyl ester (180 mg, 0.317 mmol) in DCM (1.5 ml) was added TFA (0.5 ml) and the mixture was stirred at rt for 1 h. The reaction mixture was poured on 10% aq. Nagcos, more DCM was added and the layers were separated. The aq. phase was extracted with DCM (3x), the combined DCM phases were dried with K2C03 and evaporated to e the title compound as colorless solid.

HPLC: RtH8= 3.001 min; ESlMS [M+H]+ = 4680/4700; 1H-NMR (600 MHZ, CDCI3): 6 10.22 (br. s, 1H), 8.87 (s, 1H), 8.41 (dd, 1H), 8.18 (s, 1H), 7.53 (t, 1H), 4.33 - 4.13 (m, 4H), 1.85 (s, 3H).

Examples 8 to 21: The compounds listed in Table 4 were ed by a procedure analogous to that used in Example 7.

Table 4 Compound 1H-NMR (solvent; 6) (M+1)+] (400 MHz, DMSO-de): 510.28(s, 1H), 8.38 (s, 1H), 8.15 (dd, 1H), 8.10 (br. s, 2H), 7.80 3-Amino—5-trifluoromethyl—pyrazine—Z- (dd, 1H), 5.79 (s, 2H), carboxylic acid [6-((R)amine—5,5-difluoro— 4.40 — 4.18 (m, 2H), 4-methyI-5,6-dihydro-4H-[1 ,3}oxazin-4—yl)— 1.87 (s, 3H) -fluoro-pyridiny|]-amide (400 MHz, DMSO-de): LCMS: 610.97(br. s, 1H), RtHZ 8.73 (s, 1H), 8.45 (s, =O.75; 1H), 8.17 (dd, 1H), 3,5-Dichloro—pyridine—2-carboxylic acid [6— [NM] = 7.75 (dd, 1H), 5.75 ((R)—2-amino—5,5—difluoro-4—methyl-5,6- 4340/4136 (br. s, 2H), 4.36 - 4.28 dihydro—4H—[1 ,3]oxazinyl)—5-fluoro- .0 (m, 2H), 1.66 (s, 3H) pyridin-Z-yl]—amide (400 MHz, DMSO—ds): 9.93 (s, 1H), 8.18 (dd, 1H), 7.89 (br. s, 2H), 7.78 — 7.73 (m, 1H), 7.73 (s, 1H), 5.78 o(2,2,2-trifluoro-ethoxy)pyrazine— (s, 2H), 5.05 (q, 2H), 2-carboxylic acid [6-((R)—2—amino-5,5- 4.38 - 4.27 (m, 1H), difluoromethyl-5,6-dihydro-4H- 4.25- 4.18 (m, 1H), [1 ,3]oxaziny|)fluoro-pyridinyl]- 1.88 (s, 3H) amide WO 27188 MS[m/z; Example Compound 1H-NMR (solvent; 6) (M+1)*] (400 MHz, DMSO-de): 8 9.96 (br. 3., 1H), 8.19 (dd, 1H), 8.03 - 7.75 (m, 3H), 7.67 (s, 3-Amino—5-(2,2-difluoro-ethoxy)~pyrazine 1H), 6.46 (tt, 1H), 4.63 carboxylic acid [6-((R)—2—amine—5,5—difluoro— (td, 2H), 4.42 - 4.31 4—methyl~5,6-dihydro—4H—[1,3]oxazin-4~yl)- (m, 2H), 1.71 (br. s, —fluoro-pyridinyl]—amide 3H) (400 MHz, DMSO-de): 610.14(br.s, 1H), 8.28 (d, 1H), 7.96 (t, 1H), 7.79 (br. s, 2H), 7.56 (s, 1H), 4.96 (br. o(3-fluoro—propoxy)—pyrazine—2- s, 1H), 4.80 (br. s, carboxylic acid [6-((R)—2-amino-5,5—difluoro- 1H), 4.68 (t, 1H), 4.56 4-methyI-5,6-dihydro~4H-[1 ,3]oxazin—4—yl)~ (t, 1H), 4.43 (t, 2H), -fluoro—pyridin-Z-yI]—amide 2.16 (dquin, 2H), 1.91 (br. s, SH) (400 MHz, CDCIB): 5 .49 (s, 1H), 8.36 LCMS: (dd, 1H), 8.17 (d, 1H), 7.45 (dd, 1H), 7.08 13 =0.77; -Methoxy~3~methyI-pyridine—2-ca rboxylic (dd, 1H), 4.40 (br. s, [M+1]= acid [6-((R)—2-amino-5,5—difluoro-4—methyl- 2H), 4.28 - 4.08 (m, 411.1 ,6-dihydro-4H-[1,3]oxazin-4—yl)fluoro- 2H), 3.92 (s, 3H), 2.79 pyridinyl]—amide (5,314), 1.85 (t, 3H) MS[m/z; Compound 1H-NMR (solvent; 8) W“)+l (400 MHz, DMSO-ds): 610.26(s, 1H), 8.19 (dd, 1H), 7.95 (d, 1H), 7.75 (dd, 1H), 7.36 (d, 1H), 7.09 (br. s, 2H), o-5—(3—methoxy-prop-1—yny|)- 5-79 (S: 2H). 4-39 (S, pyridinecarboxylic acid [6—((R)-2~amino- 2H). 4-37 ' 4-25 (m, fluoro—4—methyl~5,6—dihydro-4H— 1H), 426 ~ 4.12 (m, [1,3]oxazin-4—yl)~5~fluoro-pyridin—Z-yl]~ 1H), 3.32 (s, 3H), 1‘67 (s, SH) (400 MHz, DMSO-ds): 6 9.96 (s, 1H), 8.17 (dd, 1H), 7.89 (br. s, 2H), 7.76 (dd, 1H), 7.71 (s, 1H), 6.11 (d, 3-Aminofluoromethoxy—pyrazine—Z- 2H), 5.78 (s, 2H), 4.37 carboxylic acid [6—((R)—2-amino—5,5—difluoro- - 4.27 (m, 1H), 4.26 - 4-methyl-5,6-dihyd ro-4H-[1 ,3]oxazin—4-yl)- 4.15 (m, 1H), 1.66 (s, -fluoro-pyridin-Z—yl]-amide (400 MHz, DMSO-de): 6 9.90 (s, 1H), 8.17 (d, 1H), 7.98 - 7.68 (m, 3H), 7.60 (s, 1H), 5.79 (s, 2H), 4.44 (br. s, 3-Amino—5-(2-methoxy—ethoxy)—pyrazine—2- 2H) 4.36 _ 4.27 (m carboxylic acid [6—((R)-2—amino-5,5—difluoro- 1H) 425 _ 4.16 (m 4-methyI-5,6-dihydro-4H-[1,3]oxazinyl)— 1H) 3.69 (br. s 2H) -fluoro—pyridin—Z-yI]-amide 332 (s 3H) 1.66(br. s, 3H) ZOlZ/054269 MS[mlz; Compound 1H-NMR (solvent; 8) (M+1)"] (400 MHz, DMSO-de): 610.26(s, 1H), 8.19 (dd, 1H), 7.91 (d, 1H), 7.75 (dd, 1H), 7.32 (d, 17 o-5—(3—hydroxy—propynyi)— 1H), 7.09 (br. s, 2H), pyridinecarboxyiic acid {6-((R)-2—amino- 5.79 (br. s, 2 ,H), 5.46 ,5-difluoromethyl-5,6-dihydro-4H— (t, 1H), 4.44 - 4.26 (m, [1 ,3]oxaziny|)—5-fluoro-pyridinyi]— 3H), 4.26 - 4.13 (m, 1H), 1.67 (s, 3H) (400 MHz, DMSO-de): \N 610.15(s, 1H), 8.18 / (dd, 1H), 7.91 (dd, 1H ,7.75 NH2 0 ) (dd, 1H,) 7.25 (br. s, 2H), 7.11 3-Aminofluoro—pyridine-Z-carboxyiic acid (dd 1H) 578 (s 2H) [6-((R)—2-amino-5,5-difluoromethyi—5,6- 4.32 (td, 1H), 4.20 (td, dihydro-4H—[1 ,3]oxazin~4-yi)—5-fluoro- 1H), 1.66 (s, SH) pyridinyI]-amide (400 MHz, DMSO—de): 810.18(s, 1H), 8.18 (dd, 1H), 7.92 (d, 1H), 7.76 (dd, 1H), 7.39 (d, 3-Aminochloro-pyridine—2-carboxyiic acid 1H): 7-19 (br. 5! 2H)! [6-((R)—2-amino—5,5—difluoro—4—methyi-5,6- 5'79 (br- 3: 2H), 4-39 ' dihydro-4H-[1,3]oxazinyI)fluoro- 4-09 (m: 2H): 1.67 (S: pyridinyi]—amide 3H) MS[m/z; Compound 1H-NMR (solvent; 8) (M+1)+] (400 MHz, CD013): 5 .44 (br. s, 1H), 8.61 (d, 1H), 8.46 (d, 1 H), 7.90 (d, 1H), 7.53 (t. 3-Chloro-pyridine-Z-carboxylic acid[6-((R)— 1H), 7.50 — 7.44 (m, 2—amine-5,5-difluoro-4—methyl-5,6-dihydro— 1H), 4.92 (br. s, 2H), 4H-[1 ,3]oxazin-4—y1)—5-fl uoro-pyridin-Z-y1]— 4.39 - 4.17 (m, 2H), 1.91 (br. s, 3H) (400 MHz, CDCI3):8 .45 (br. s, 1H), 8.62 (d, 1H), 8.47 (dd, 1H), 21 7.91 (d, 1H), 7.56 (dd. 3-Chloro(3-methoxy-prop 1H), 4.47 - 4.24 (m, ynyl)pyridine—2-carboxy1ic acid [6—((R)—2— 4H), 8.48 (s, 3H), 1.95 amino-5,5-difluoromethyI—5,6-dihydro- (br. s, 3H) 4H-[1 zinyI)fl uoro-pyridin-Z-y1]~ amide es 22 to 36: The compounds ted below in Table 5 were also prepared by a procedure analogous to that used in Example 7. Examples 26 and 27 were separated after the deprotection step by prep. TLC (DCM/MeOH 95:5).

MS [m/z; 1H-NMR (solvent; 6) (”I“)+] (400 MHZ, DMSO—de): 6 10.44 (br. s, 1H), LCMS: 8.28 - 8.13 (m, 2H), RtH2 8.02 - 7.84 (m, 3H), =0.69; 3-Aminodifluoromethyl-pyrazine—2- 6'98 (t, 1H) CHFZ)’ [MM] = 4.66 — 4.57 (m, 2H), carboxylic acid [6-((R)—2-amino-5,5-difluor0_ 432.2 1.82 4-methyl-5,6-dihydro-4H-[1,3]oxazinyl)-5— (S, 3H) fluoro-pyridinyl]—amlde (400 MHZ, DMSO—de): 9.91 (s, 1H), 8.17 (dd, 1H), 7.87 (br. s, LCMS: 2H), 7.74 (d, 1H), 7.76 RtHz (d, 1H), 7.62 (s, 1H), =0.79; .83 (br. s, 1H); 4.66 - [M+1]= 3-Amino-5—(2—chloro—ethoxy)-pyrazlne 453 (m, 2H), 4‘40 _ 460.1/462. carboxylic acid [6—((R)—2-amino-5,5-dlfluoro- 4.14m] 2H) 4.06- 1 4"methYI‘5,6'dihYdr0‘4H'[1,3]OX82in—4'yl)‘5' 397 (m 2H) 166 (S fluoro-pyridin—2-yl]—amlde Compound Structure 1H-NMR (solvent; 5) (400 MHz, s): 810.68(s, 1H), 8.46 (br s, 1H), 8.18 (d, LCMSI 1H), 7.89 (s, 1H), 7.74 RtHZ (t, 1H), 7.08 (d, 1H), =0.79; 6.85 (d, 1H), 6.47 (t, [M+1] = 3—Chloro—5-(2,2—difluoro—ethoxy)—pyridine—2- 1H, CHF2), 4.69 — 482. carboxylic acid [6-((R)—2-amino—5,5-difluor0- 4.51 (m, 2H), 4.43 - 1 4-methyI-5,6-dihydro—4H-[1 ,3]oxazin-4—yl)—5— 4.17 (m, 2H), 1.66 (s, fluoro-pyridin-Z-yl]—amide (400 MHz, DMSO-de): 810.00(s, 1H), 8.21 (d, 1H), 7.90 (br. s, 2H), 7.82 (t, 1H), 7.68 (s, 1H), 4.91 - 4.82 (m, 1H), 4.78 - 4.69 3-Amino—5-(2-fluoro—ethoxy)-pyrazine-2— (m, 1H), 4.65 - 4.57 carboxylic acid [6—((R)-2—amino~5,5—difluor0- (m, 1H), 4.56 - 4.49 yl-5,6-dihydro-4H-[1 ,3]oxazinyi)~5- (m, 1H), 4.41 (br. s, fiuoro—pyridin-Z—yI]-amide 2H), 1.75 (s, SH) (400 MHz, DMSO-de): 8 10.80 (s, 1H), 8.53 LCMS: (s, 1H), 8.18 (d, 1H), RtH2 7.97 (s, 1H), 7.75 (t, =O.74; 1H), 6.13 (s, 1H), 6.00 [M+1] = 3-Chlorofluoromethoxy-pyridine—Z— (s, 1H), 5.78 (br. s, 448.1/450. carboxylic acid [6-((R)amino-5,5-difluoro- 2H), 4.46 - 4.17 (m, 2 4-methyl-5,6-dihydro-4H-[1 ,3]0xazin-4—yi) 2H), 1.66 (s, 3H) fluoro-pyridin-Z-yH—amide WO 27188 PCT/IBZOIZ/054269 MS [mlz; Compound Structure 1H-NMR (solvent; 5) (M+1)*] (400 MHz, e): LCMSI 810.80(s, 1H), 8.38 RtHZ (s, 1H), 8.18 (d, 1H), =0.81; 27 7.83 - 7.87 (m, 2H), [MM] = 3—Chloro-5—ethoxy-pyridineQ—carboxyiic acid 5.82 (br. s, 1H), 4.41 - 444.1/446. [6-((R)amino~5,5—difluoro~4-methyI-5,6— 4.15 (m, 4H), 1.88 (s, dihydro-4H-[1,3]oxazinyI)fluoro~pyridin~ 3H), 1.38 (t, SH) 2-yi]~amide DD!WAN (600 MHz, DMSO-ds): N/ N 8 9.90 (s, 1H), 8.17 (d, LCMS: 1H), 7.90 (br. s, 2H), RtHZ 28 7.75 (t, 1H), 7.56 (s, =0.79; 3-Amino-5—(penta-deutero—ethoxy)—pyrazine— 1H), 5.82 (br. s, 2H), [W1] = 2-carboxylic acid [6—((R)amino-5,5- 4.32 (q, 1H), 4.20 (q, 431.3 difluoromethyi—5,6—dihydro—4H- 1H), 1.88 (s, 3H) [1 ,3]oxazinyl)fluoro-pyridinyl]—amide (800 MHz, DMSO-ds): 8 10.18 (s, 1H), 8.18 (d, 1H), 7.90 (s, 1H), LCMS: 7.77 (t, 1H), 7.82 (br. RtHg s, 2H), 5.85 (br. s, =0.69; 3-Amino—5-(2—methoxy-ethyl)-pyrazine 1H), 4.34 (q, 1H), 4.22 [MM] = carboxyiic acid [6-((R)—2-amino-5,5-difluoro— (q, 1H), 3.71 (t, 2H), 440.3 4-methyi-5,6-dihydro-4H-[1 ,3]oxazinyi) 3.25 (s, 3H), 2.92 (t, fluoro-pyridin-Z-yi]—amide 2H), 1.87 (s, 3H) PCT/IBZOlZ/054269 MS [m/z; Compound Structure 1H-NMR (solvent; 5) (M+1)*] (400 MHz, DMSO-de): LCMS: 810.27(s, 1H), 8.81 RtHQ (s, 1H), 8.14 - 8.01 =O.74; (m, 1H), 7.94 (s, 1H), 1M+11 = 7.84 - 7.68 (m, 2H), 4—ChiorodifluoromethyI-1 H-pyrazoIe 439.1/441. 4.83 carboxylic acid [6-((R)—2-amino-5,5-difluoro- (t, 2H), 1.66 (s, 4-methyi-5,6-dihydro-4H-[1 zin-4—y|)-5— fluoro-pyridinyI]-amide (400 MHz, DMSO-de): 510.22 (s, 1H), 8.37 LCMS: (d, 1H), 8.18 (dd, 1H), R1112 7.97 (d, 1H), 7.78 (dd, =0.60; 1H), 7.65 (br. s, 2H), 3-Amino—pyrazine-Z-carboxylic acid )— [M+1] = .85 (br. s, 2H), 4.42 - 2-amino-5,5-difluoro-4—methyi—5,6-dihydro— 382.2 4.15 (m, 2H), 1.68 (s, 4H-[1,3]oxazin-4—yl)—5-fluoro—pyridinyi]— amide (400 MHz, DMSO-ds): 810.99(s, 1H), 8.68 LCMS: (s, 1H), 8.23 (s, 1H), RtHZ 8.17 (d, 1H), 7.75 (t, =O.68; 1H), 5.76 (br. s, 2H), 1M+1i = 3-Chloro-5—(3-hydroxy-prop-1—ynyi)~pyridine- 5.52 (t, 1H), 4.39 (d, 454.2/456. 2-carboxylic acid [6-((R)—2-amino-5,5- 2H), 4_32 (br. s, 2H), 1 dif]uoro-4—methyl-5,6~dihydro-4H- 1.66 (s, 3H) [1 ,3]oxazin-4—y|)fluoro-pyridinyI]-amide PCT/IBZOlZ/054269 MS [mlz; nd Structure 1H-NMR (solvent; 8) (MM)+] (400 MHZ, s): 510.34(s, 1H), 8.20 (dd, 1H), 8.07 (s, 1H), LCMS: 7.77 (dd, 1H), 7.48 (s, RtHz 1H), 7.24 (br. s, 2 H), =0.74; 3—Aminodifluoromethyl-pyridine—Z- 7.14 (1, 1 H, CHF2), [M+1] = carboxylic acid [6-((R)—2-amino—5,5-difluoro- 5.80 (s, 2H), 4.39 - 431.2 4-methyl-5,6—dihyd ro-4H-[1 ,3]oxazin-4—yI) 4.14 (m, 2H), 1.67 (s, fluoro-pyridiny1]—amide 3H) (400 MHZ, DMSO-de): LCMS: 8 9.99 (s, 1H), 8.13 (dd, 1H), 7.97 (br. 3, =0.81; 2H), 7.80 (dd, 1H), [M+1]= 3-Aminochloro—5—(1,1-dif1uoro—ethy|)— 5.83 (br. s, 2H), 4.43 - 480.2/482. pyrazine-Z—carboxylic acid [6-((R)—2-amino- 4.17 (m, 2H), 2.05 (t, ,5—difiuoro—4—methyI-5,6—dihydr0-4H- 3H), 1.68 (s, 3H) [1 ,3]oxazin—4—yl)fluoro-pyridin-Z-yU-amide (600 MHZ, DMSO-de): 10.41 (s, 1H), 9.26 LCMS: (s, 1H), 8.64 (dd, 1H), RtHg 8.35 (d, 1H), 8.23 (d, =0.66; -Cyano-pyridine—Z—carboxylic acid [6-((R)- 1H), 7.82 (t, 1H), 5.83 2-amino—5,5-difluoromethyI-5,6-dihyd ro- (br. s, 2H), 4.40 - 4.20 4H-[1,3]oxazin-4—yI)-5—fluoro—pyridin-Z—yl]— (m, 2H), 1.88 (s, 3H) amide PCT/IBZOlZ/054269 Compound Structure 1H-NMR (solvent; 8) (600 MHz, CDCI3): 8 .30 (br. s, 1H), 8.74 LCMS: (s, 1H), 8.49 - 8.36 RtHB (m, 1H), 8.03 (s, 1H), =2.981; 7.52 (t, 1H), 4.33 (br. [M+1] = 3-Chloro(1,1—difluoro~ethyI)—pyridine s, 1H), 4.25 - 4.13 (m, 464.0/466. carboxylic acid [6-((R)amino—5,5-difluoro- 2H), 2.04 (t, 3H), 1.85 4-methyl-5,6-dihydro-4H—[1 ,3]0xazin-4—yl)—5- (s, 3H) pyridin-Z-yl]—amide Exam le 37: 3-Amino 1 1-difluoro-eth | - razinecarbox lic acid 6- amino-5 5- To a solution of3—amino—6-chloro(1,1—difiuoro—ethyl)~pyrazinecarboxylic acid [6-((R) amine-5,5—difluoro-4—methyl-5,6-dihydro-4H-[1 ,3]oxazinyl)fluoro-pyridin-2—yl1-amide [Example 34] (54 mg, 0.113 mmol) in MeOH/THF (1:1, 10 ml) was added Pd/C 10% (BASF 4505 D/R E, 12 mg) and the mixture was set under an hydrogen atmosphere. After 2.5 h more Pd/C % (BASF 4505 D/R E, 11 mg) was added and the hydrogenation continued for another 2.5 h.

The reaction mixture was filtered h a pad of Celite, washed with MeOH and the t evaporated. The residue was purified by tography on silica gel (DCM to DCM/MeOH 9:1) to provide the title compound as yellow foam.

HPLC: RtH2= 0. 76 min; ESIMS [M+H]+= 446.2; 1H-NMR (400 MHz, DMSO~d6): 8 10.25 (s, 1H), 8.22 (s, 1H), 8.17 (dd, 1H), 7.92 (s, 2H), 7.79 (dd, 1H), 5.82 (br. s, 1H), 4.44 - 4.14 (m, 2H), 2.00 (t, 3H), 1.88 (s, 3H) Preparation of intermediates Alternative sis of (R)amino(6-bromofluoro-pyridinyl)-2,2-difluoro-butan- 1-ol (Example 1 intermediate 9): a) 1-(6-Bromofluorotriethylsilanyl-pyridinyl)-ethanone To a solution of diisopropylamine (11.33 g, 112 mmol) in THF (200 ml) was added n-BuLi (44.8 ml, 2.5 moi/L in hexanes) below -50 °C. A solution of 2-bromofluorotriethylsilanyI—pyridine (25 g, 86 mmol) in THF (25 ml) was added to the LDA-solution at —78 °C in a drop wise manner below ~65 °C. After 70 minutes at -78 °C DMA (10.49 ml, 112 mmol) was added drop wise in a fast manner to the deep red solution keeping the temperature below -57 °C. After 30 minutes the cooling bath was removed and the reaction mixture was allowed to reach -40 °C. The cold reaction mixture was poured on a mixture of2M aq. H01 (160 ml) / water (200 ml) / brine (100 ml). Tert.-butyl methyl ether was added and the layers were separated. The organic phase was washed twice with brine, dried over magnesium e, filtered and evaporated to give a yellow oil. The crude product (28.67 g) was used in the next step without purification.

TLC (cyclohexane/ethyl acetate 10:1): R,« = 0.61; LC-MS: Rtm = 1.46 min; (98 % purity; ESl+~lVlS: m/z 332 [(M+H)+,1Br}; 334); 1H-NMR (400 MHz, CDCI3): 7.59 (d, J=2.8 Hz, 1H), 2.70 (s, 3H), 1.06 — 0.83 (m, 15H). b) (R)(6-Bromofluorotriethylsilanyi-pyridinyl)-2,2-difluoro((R)methyl- propane-Z-sulfinylamino)—butyric acid ethyl ester a) A mixture of etraethoxide (25.07 g, 110 mmol), (R)—tert.-butylsulfinamide (13.32 g, 110 mmol) and 1-(6-bromofluoro—4-triethylsilanyl—pyridinyl)—ethanone (28.67 g, 85 mmol, 98 % pure) in THF (250 ml) was heated under a en atmosphere for 24 hours at 60 °C. The cold reaction mixture was then trated to remove ethanol. Dry toluene (2x150 ml) was added and removed in vacuo to minimize the content of ethanol. Finally dry THF (250 ml) was added. b) The Reformatsky reagent was prepared in a te flask: To a suspension of zinc (17.15 g, 262 mmol) and (|) chloride (1.256 g, 12.68 mmol) in dry THF (20 ml) were added 3 drops of trimethylchlorosilane under nitrogen to activate the zinc. After 10 minutes ethyl 2-bromo—2,2- difluoroacetate (51.5 g, 254 mmol) was added slowly by syringe between 25 and 35 °C. (Slightly exothermic with induction period) The reaction mixture was kept in an ultrasound bath for 45 minutes.

The sulfoximine solution was cooled to 0 °C and the Reformatsky reagent b) was quickly added to the sulfoximine solution a). The g bath was removed and stirring was continued at 50 °C for 4 h.

The cold reaction mixture was poured onto ice cold aqueous 5% sulfuric acid solution (300 ml) with gentle stirring. The suspension was diluted with water (150 ml) and TBME (500 to 1000 ml) and was stirred at rt for 30 min (pH about 3-4). The organic phase was washed thoroughly with plenty of water with backextraction of the aqueous phase. The organic phase was finally washed with brine, dried over magnesium sulfate, filtered and concentrated. The crude product (52.4 g brown-red oil, 65.3 % yield) was used in the next step without purification.

TLC (cyclohexane/ethyl acetate 2:1 ): R = 0.46; LC-MS: Rtm = 1.53 min; (47 % purity; ES|+-MS: m/z 559 [(M+H)*,1Br]; 561); main isomer; LC—MS: Rtm = 1.55 min; (11.9 °/o purity; S: m/z 559 [(M+H)+,1Br]; 561); minor isomer. c) (R)(6-Bromofluoro-pyridinyl)-2,2-difluoro((R)methyl-propane sulfinylamino)-butyric acid ethyl ester Freshly ground KF (9.78 g, 168 mmol) was added to a on of (R)—3-(6-bromo-3—f|uoro—4~ triethylsilanyl-pyridinyI)-2,2—difluoro((R)—2-methyl-propane—2~sulfinylamino)—butyric acid ethyl ester (52.34 g, 56.1 mmol, 60 % pure) and acetic acid (9.64 ml, l) in THF (200 ml).

DMF (200 ml) was added and the suspension was stirred at rt. After 3 hours the on mixture was diluted with TBME and washed thoroughly with water, sat. sodium bicarbonate solution, water and brine, dried over magnesium sulfate, filtered and evaporated. The crude product (35.9 g yellowish-brown oil, 86 % yield, 60 % purity) was used in the next step without ation.

TLC (cyclohexane/ethyl acetate 2:1): R1: = 0.30; LC-MS: Rtm = 1.10 min; (53 % purity; ESI+—MS: m/z 445 +,1Br]; 447); main isomer; LC-MS: Rtm = 1.15 min; (7 % purity; ESl+-MS: m/z 445 [(M+H)*,1Br]; 447); minor isomer. d) (R)Methyl-propanesulfinic acid [(R)(6-bromofluoro-pyridin-Z-yl)-2,2,difluoro- oxymethyl-propyl]amide To a solution of (R)—3-(6-bromofluoro-pyridinyl)-2,2-difluoro((R)methyl—propane sulfinylamino)—butyric acid ethyl ester (35.9 g, 48.4 mmol) in THF (225 ml) was portion wise added mborohydride (2.63 g, 121 mmol) with external g. The exothermic on was stirred ar rt for 60 min. Crushed ice and water was added carefully and the reaction e was diluted with TBME and neutralised with 2N HCl solution. The organic phase was washed with water and brine, dried over magnesium sulfate in the presence of charcoal, filtered and evaporated. The crude product (29.74 g brown-yellow sticky oil-resin) was used in the next step t purification.

TLC (cyclohexane/ethyl acetate 1:1): R = 0.30; LC—MS: Rtm = 0.94 min; (83 % purity; ESl+—MS: m/z 403 [(M+H)+,1Br]; 405); main isomer; LC-MS: Rtm = 1.15 min; (14 % ; ESl+-MS: m/z 403 {(M+H)+,1Br]; 405); minor isomer. e) (R)Amino(6-bromofluoro-pyridinyl)-2,2-difluoro-butanol camphersulfonic acid salt To a cold solution of (R)methyl-propane—2—sulfinic acid [(R)—1—(6—bromo—3-fluoro-pyridinyl)- 2,2,difluoro-3—hydroxy—1—methyl-propyl]amide (29.74 g, 61.2 mmol, 83 % pure) in ol (150 ml) was added HCI/dioxane 4N (59.8 ml, 239 mmol). The reaction mixture was stirred for 2.5 hours at rt. The solvent was evaporated and to the residue was added TBME (300 ml) and crushed ice. The organic phase was extracted with water (3x200 ml, pH reajusted to about 2 with each extraction using 2N HCI solution). The aq. phase was washed with TBME and solid potassium carbonate was added. The free base was extracted with TBME and dried over magnesium sulfate, filtered and evaporated. 15.5 g brown oil. LC-MS crude Rt=0.43 min. (85 %, ES+ m/z 299, 301).

(+)—Campher sulfonic acid salt: (R)Amino(6-bromo-3—fluoro-pyridinyl)-2,2-difluoro-butan- 1-ol (13 g crude material, 36.52 mmol) and (+)-CSA monohydrate (9.13 g, 36.52 mmol) in acetone (230 ml) was heated until dissolution. The solution was cooled down to rt and kept 10 hrs at -20 °C. The solid was filtered and washed with ice cold acetone and dried at 70 °C for 2 hrs in a vacuum oven. 13.66 9 white solid. (theoretical yield: 19.38 g: 70 %). LC-MS : Rt=0.45 PCT/IBZOIZ/054269 min. (> 98 % purity, ES+ m/z 299, 301 weak signal). Chiral HPLC: Chiracel OD-H, 250x46 mm; heptane-ethanoi-methanol 95:3:2, 1ml/min., Rt=14.188 min 90.76 %; Rt=16.17 min. 9.2 %: e.e. 82 %.

Recrystallization: 13.66 g was recrystallised from a mixture of hot acetone (220 ml) and ethanol (50 ml). Clear solution. The flask was kept at ~20 °C over the weekend. The solid was filtered, washed with ice cold e and dried in a vacuum oven at 70 °C. White solid: 9.31 g. LC-MS Rt=0.45 min. (100 % pure, ES+ m/z 299, 301). Chiral HPLC: Chiracel OD—H, 250x46 mm; heptane-ethanol-methanoi 952322, 1m|/min., Rt=14.205 min 98.21 %; Rt=16.207 min. 1.7 %: e.e. 96.4 %. Free base: 1H-NMR (400 MHz, e): 8 7.76 — 7.70 (m, 2H), 5.29 (br. s, 1H, CH), 3.89 - 3.70 (dt, 2H, CH2), 1.59 (s, 3H). ation of substituted acid building block intermediates The substituted acid building blocks were either commercially available or can be prepared as described hereafter or in an analogous manner.

Acid-1: 3-Amino-S-(2,2,2-trif|uoro-ethoxy)-pyrazinecarboxylic acid a) 3-Amino(2,2,2-trifluoro-ethoxy)-pyrazinecarboxylic acid methyl ester A e of 2,2,2-trifluoro-ethanoi (6.9 ml, 96 mmol) and cesium carbonate (1.56 g, 4.8 mmol) was stirred for 20 min, 3-amino-5—chloro-pyrazinecarboxyiic acid methyl ester [286435] (600 mg, 3.2 mmol) was added and the mixture was stirred at rt for 42 h. To te the reaction the mixture was heated to reflux for another 3 h. Saturated aq. NH4CI was added and the mixture was extracted with EtOAc, the combined organic layers were washed with saturated aq. sodium chloride, dried with Na2804 and evaporated. The residue was purified by chromatography on silica gel (cyclohexane to exane/EtOAc 3:7) to provide the title compound as colorless solid.

HPLC: RtH1= 0.83 min; ESIMS {M+H]+ = 252.2; 1H-NMR (400 MHz, DMSO-o‘s): a 7.66 (s, 1H), 7.60 (br. s, 2H), 5.03 (q, 2H), 3.81 (s, 3H). b) 3-Amino(2,2,2-trif|uoro-ethoxy)—pyrazinecarboxylic acid To a on of 3-amino—5—(2,2,2-trifluoro—ethoxy)-pyrazine-2—carboxylic acid methyl ester (400 mg, 1.59 mmol) in THF (20 mt) was added 1N sodium hydroxide (2.5 ml, 2.5 mmol) and the PCT/IBZOIZIOS4269 mixture was stirred at room temperature over night. To the mixture were added 1N HCl (2.39 ml, 2.39 mmol) after stirring for 5 min toluene was added and the solvents were evaporated to provide the title compound er with sodium chloride as an off-white solid. The e was used for coupling reactions without further purification.

HPLC: RtH1= 0.71 min; ESllVlS [M+H]+ = 238.2; 1H-NMR (400 MHz, DMSO-ds): 5 7.46 (s, 1H), 4.97 (q, 2H).

Acid-2: 3-Amino(2,2-difluoro-ethoxy)-pyrazinecarboxylic acid The title compound was prepared by an analogous ure to Acid-1 using fluoro- ethanol instead of 2,2,2—trifluoro—ethanol [Acid-1 step a)].

HPLC: RtH2= 0.60 min; ESIMS [M+H]+ = 220.2; ‘H-NMR (400 MHz, DMSO-ds): 5 12.51 (br. s, 1H), 7.62 (s, 1H), 6.43 (tt, 1H), 4.59 (td, 2H).

Acid-3: 3-Amino(3-fluoro-propoxy)-pyrazinecarboxylic acid The title compound was prepared by an analogous procedure to Acid-1 using 3-fluoro-propan 01 instead of 2,2,2-trit’luoro—ethanol [Acid-1 step a)] and lithium hydroxide instead of sodium hydroxide [Acid-1 step b)].

HPLC: RtH1= 0.60 min; ESIMS [M+H]+ = 216.1; 1H-NMR (400 MHz, DMSO—ds): 6 8.98 (br. s, 1H), 7.19 (s, 1H), 6.82 (br. s, 1H), 4.65 (t, 1H), 4.53 (t, 1H), 4.32 (t, 2H), 2.20 - 1.99 (m, 2H). : 3-Amino(3-fluoro-propoxy)—pyrazinecarboxylic acid The title compound was prepared by an analogous procedure to Acid-1 using 2-methoxy-ethanol d of 2,2,2-trifluoro—ethanol [Acid-1 step a)].

HPLC: R1,“: 0.53 min; ESIMS [M+H]+ = 214.2; 1H-NMR(400 MHz, s): 6 12.49 (br. s, 1H), 7.54 (br. s, 2H), 7.51 (s, 1H), 4.49 - 4.33 (m, 2H), 3.71 - 3.60 (m, 2H), 3.30 (s, 3H).

Acid-5: 3-Amino(2-fluoro-ethoxy)-pyrazlnecarboxylic acid a) 3-Aminooxy-pyrazinecarboxylic acid methyl ester To a solution of 3-amino-pyrazine-Z-carboxylic acid methyl ester [162986] (15 g, 98 mmol) in CHCl3 (245 ml) was added mCPBA (26.6 g, 108 mmol) and the resulting mixture was heated up to reflux for 40 min. To complete the reaction, more mCPBA (2.5 g) was added and the reaction was heated to reflux for another 40 min. The mixture was diluted in DCM/Chlorofom (1/1) and then saturated aq. NaHCO3 was added. The organic layer was separated and the aqueous layer was extracted several times with DCM/Chloroform (1/1). The combined organic layers were dried with NaZSO4, ed and evaporated to give a yellow solid. (12.6 g, 68% yield, 90% purity) HPLC: R1,“: 0.33 min; ESIMS [M+H]+= 170.1; 1H—NMR (400 MHz, DMSO-de): 6 8.48 (d, 1H), 7.88 (d, 1H), 7.70 (br. s, 2H), 3.89 (s, 3H). b) 3-Acetylaminooxo-4,5-dihydro-pyrazinecarboxylic acid methyl ester A solution of 3-amino—4-oxy—pyrazinecarboxylic acid methyl ester (11.3 g, 66.8 mmol) in A020 (150 ml, 1590 mmol) and AcOH (200 ml) was heated to 120 °C for 2 h, then the reaction was cooled to rt, the solvent was evaporated and co—evaporated with toluene. The resulting crude material was directly used in the next step without further purification.

HPLC: Rtm= 0.45 min; ESIMS [M+H]+= 212.1; 1H—NMR (400 MHZ, DMSO—ds): 6 12.55 (br. 8, 1H), 11.04 - 10.75 (m, 1H), 7.76 (br. s, 1H), 3.81 (s, 3H), 2.25 (8, 3H). c) 3-Acetylamino(2-fluoro-ethoxy)-pyrazinecarboxylic acid methyl ester To a solution of 3-acetylaminooxo-4,5-dihydro-pyrazine—Z-carboxylic acid methyl ester (300 mg, 1.136 mmol, 80% purity) in dry THF (8 ml) under argon were added nylphoshine (119 mg, 0.455 mmol) and diethyl azodicarboxylate (DEAD, 0.072 ml, 0.455 mmol) at -10 °C. The on was stirred at —10 °C for 15 min and then 2-fluoro—ethanol (0.033 ml, 0.568 mmol) was added. The on was stirred at rt for 15 min. To complete the reaction, more nylphoshine (119 mg, 0.455 mmol) and DEAD (0.072 ml, 0.455 mmol) were added at ~10 °C and the resulting mixture was d at -10 °C for 15 min before the addition of 2-fluoro- ethanol (0.033 ml, 0.568 mmol). The on was stirred for 100 min. More triphenylphoshine (119 mg, 0.455 mmol) and DEAD (0.072 ml, 0.455 mmol) were added at -10 °C and the resulting mixture was stirred at ~10 °C for 15 min before the addition of 2-fluoroethanol (0.033 ml, 0.568 mmol). The reaction was stirred for another 2 h. Saturated aq. NaHCO3 was added and the mixture was extracted with EtOAc, the combined organic layers were washed with aq. sodium chloride, filtered and dried with NaQSO4 and evaporated. The residue was purified by chromatography on silica gel (DCM to DCM/EtOAc 9:1) to provide the title compound as yellow oil (300 mg).

HPLC: RtH2= 0.63 min; ESIMS [M+H]+ = 258.4; 1H—NMR (400 MHz, DMSO-o‘s): a 10.70 (s, 1H), 8.14 (s, 1H), 4.98 - 4.81 (m, 1H), 4.77 - 4.72 (m, 1H), 4.68 - 4.63 (m, 1H), 4.60 - 4.56 (m, 1H), 3.79 (s, 3H), 2.21 (s, 3H). d) 3-Amino(2-fluoro-ethoxy)—pyrazine-Z-carboxylic acid methyl ester To a mixture of 3-acetylamino—5-(2—fluoro-ethoxy)-pyrazine—Z-carboxylic acid methyl ester (330 mg, 0.962 mmol) in dry MeOH (12 ml) was added sodium methoxide (52.0 mg, 0.962 mmol) at 0 °C. The resulting suspension was stirred at rt for 1 h. Saturated aq. NH4Cl, was added and then mixture was extracted with EtOAc. The combined organic layers were dried with Na2804, filtered and evaporated. The residue was d by chromatography on silica gel (DCM to DCM/EtOAc 9:1) to provide the title compound as white solid (176 mg).

HPLC: RtH2= 0.62 min; ESIMS [M+H]+ = 216.1; 1H-NMR (400 MHz, DMSO-ds): 6 7.56 (s, 1H), 7.50 (br. s, 2H), 4.87 - 4.79 (m, 1H), 4.74 - 4.67 (m, 1H), 4.62 - 4.55 (m, 1H), 4.53 - 4.45 (m, 1H), 3.80 (s, 3H). e) 3-Amino(2-fluoro-ethoxy)-pyrazinecarboxylic acid To a solution of 3-amino(2-fluoro-ethoxy)-pyrazinecarboxylic acid methyl ester (176 mg, 0.818 mmol) in THF (6.8 ml) was added a solution of 1M NaOH (900 pl, 0.900 mmol). The reaction was d at rt for 48 h. A on of 1M HCl (1096 0L, 1.096 mmol) was added, the mixture was evaporated to dryness and then co-evaporated with toluene to give a light purple solid (212 mg). The crude material was used directly for the coupling reactions.

HPLC: RtH2= 0.50 min; ESIMS {M+H]+ = 202.1; 1H-NMR (400 MHz, DMSO-de): 6 12.52 ( br. s, 1H), 7.56 (br. s, 2H), 7.54 (s, 1H), 4.83 (dd, 1H), 4.71 (dd, 1H), 4.60 — 4.54 (m, 1H), 4.50 (dd, 1H).

Acid-6: 3-Amino(2-chloro-ethoxy)-pyrazinecarboxylic acid The title compound was prepared by an analogous procedure to Acid-5 using 2-chloro-ethanol instead of 2-fluoro-ethanol [Acid-5 step c)], adding more 1M NaOH (200 pl, 0.200 mmol) after 48 h of stirring in step e).

HPLC: RtH2= 0.62 min; ESIMS = 218.1; 1H-NMR (400 MHZ, a): 6 12.45 (br. s, 1H), 7.69 (br 8, 2H), 7.48 (s, 1H), 4.59 - 4.46 (m, 2H), 4.01 — 3.93 (m, 2H).

Acid-7: 3-Amino-S-penta-deutero-ethoxy-pyrazinecarboxylic acid PCT/IBZOlZ/054269 The title compound was prepared by an analogous procedure to Acid-5 using penta-deutero- ethanol instead of 2—fluoro-ethanol [Acid-5 step 0)], applying a reaction time of 24 h after the second addition of nylphosphine, DEAD and deutero-ethanol instead of 1 h in step HPLC: RtH2= 0.58min; ESlMS [M+H}+= 189.1 1H-NMR (400 MHz, DMSO-de): 5 12.43 (br. s, 1H), 7.52 (br. s, 2H), 7.46 (s, 1H).

Acid-8: 3-Amin0[2-(tert-butoxycarbonyl-methyl-amino)-ethoxy]-pyrazinecarboxylic acid The title compound was prepared by an analogous procedure to Acid-5 using utyl 2- hydroxyethyl-methyI-carbamate [57561—39-4] instead of 2-fluoro-ethanol [Acid-5 step c)}, applying a reaction time of 24 h after the third addition of triphenylphosphine, DEAD and 2- hydroxyethyl-methyI-carbamate instead of 2 h in step c). In step e) a second and a third addition of 1M NaOH (106 pl, 0.106 mmol) after 72 h and after 144 h were done, involving the quenching of 1M HCI (539 pl, 0.589 mmol).

HPLC: RtH2= 0.82 min; ESIMS [M+H]+ = 313.1 1l—l-NMR (400 MHz, DMSO-de, main rotamer): 5 7.32 (br. s, 1H), 4.34 (br. s, 2H), 3.55 (br. s, 2H), 2.83 (s, 3H), 1.29 (br. s, 9H).

Acid-9: 3-(di-tert-Butoxycarbonyl-amino)difluoromethyl-pyrazine-Z-carboxylic acid a) 3-Aminovinyl-pyrazinecarboxylic acid methyl ester To a mixture of 3-aminochloro—pyrazine—Z—carboxylic acid methyl ester (GB 1248146, 161 mg 2O 0.86 mmol), yl(vinyl)tin (0.352 ml, 1.204 mmol) and lithium chloride (102 mg, 2.498 mmol) in DMF (4 ml) was added PdCl2(PPh3)2 (30.2 mg, 0.043 mmol) and the mixture was heated to 85 °C for 2.5 h. After cooling to room temperature water was added and the mixture was extracted with EtOAc, the ed organic layers were washed with water and half ted aq. NaCl, dried with Na2804 and evaporated. The e was purified by chromatography on silica gel (cyclohexane to cyclohexane/EtOAc 1:9) to provide the title compound as yellow solid.

HPLC: RtH4= 0.71 min; ESIMS [M+H]+= 179.9; 1H-NMR (600 MHZ, DMSO-de): 6 8.04 (s, 1H), 7.35 (br. 8, 1H), 6.75 (dd, 1H), 6.38 (d, 1H), 5.70 (d, 1H), 3.84 (8, 3H). b) 3-(di-tert-Butoxycarbonyl-amino)vinyl-pyrazinecarboxylic acid methyl ester To an ice cooled solution of 3-aminovinyl-pyrazine-2;carboxylic acid methyl ester (1.28 g, 7.14 mmol) in DCM (45 ml) was added 80020 (8.58 g, 39.3 mmol) and the mixture was stirred at room temperature for 30 min, then the mixture was heated to 40 °C for 4 h. After cooling to room temperature water was added and the e was extracted with DCM. The combined organic layers were washed with 0.5N HCI and saturated aq. NaCl, dried with Na2804 and evaporated.

The residue was purified by chromatography on silica gel (cyclohexane+5% NEt3 to EtOAc+5% NEt3) to provide the title nd as yellow solid.

HPLC: RtH1= 1.15 min; ESlMS [M-Boc]+= 280.3; 1H-NMR (400 MHz, DMSO-de): 6 8.93 (s, 1H), 7.00 (dd, 1H), 6.51 (dd, 1H), 5.86 (dd, 1H), 3.88 (s, 3H), 1.34 (s, 18 H). c) 3-(di-tert-Butoxycarbonyl-amino)formyl-pyrazinecarboxylic acid methyl ester A mixture of tert—butoxycarbonyI-amino)—5-vinyl—pyrazinecarboxylic acid methyl ester (1 g, 2.64 mmol) and sodium bicarbonate (0.332 g, 3.95 mmol) in DCM (45 ml) and MeOH (15 ml) was cooled to -78 °C and purged with oxygen for 5 min. The reaction mixture was treated with ozone for 40 min until the mixture turned blue. The on mixture was purged with oxygen for 10 min and with nitrogen for 10 min, then dimethyl sulfide (0.487 ml, 6.59 mmol) was added at - 78 °C and the mixture was allowed to warm to room temperature. The mixture was d with DCM and washed with 10% aq. sodium thiosulfate. The aq. layer was extracted with DCM and the combined organic layers were dried with Na2804 and evaporated to provide the title compound as yellow oil. The compound was used for the next step without r purification. 1H-NMR (400 MHZ, DMSO-ds): 5 10.07 (8, 1H), 9.24 (S, 1H), 3.94 (8, 3H), 1.36 (s, 18H). d) 3-(di-tert-Butoxycarbonyl-amino)difluoromethyl-pyrazinecarboxylic acid methyl ester To an ice cooled solution of 3-(di-tert-butoxycarbonyl—amino)formyl—pyrazine—2-carboxylic acid methyl ester (550 mg, 1.44 mmol) in DCM (20 ml) was added dropwise within 1 h Deoxofluor (50% in THF, 0.798 ml, 4.33 mmol). Stirring was ued at 0 °C for 2.5 h then the reaction mixture was allowed to room temperature over night. ted aq. sodium bicarbonate was added and the mixture extracted with EtOAc, the combined organic layers were washed with sat. aq. sodium chloride, dried with N82$O4 and evaporated. The residue was purified by chromatography on silica gel (cyclohexane+5% NEt3 to cyclohexane+5% NEt3/ EtOAc+5% NEt3 1:1) to provide the title compound as colorless solid.

HPLC: RtH1= 1.14 min; ESIMS [2M+Na]+= 829.6; 1H-NMR (600 MHz, DMSO-da): 6 9.14 (s, 1H), 7.26 (t, 1H, CHF2), 3.92 (s, 3H), 1.33 (s, 18H). e) 3-(di-tert-ButoxycarbonyI-amino)difluoromethyl-pyrazinecarboxylic acid To a solution of 3-(di-tert—butoxycarbonyl-amino)—5-difluoromethyl-pyrazine-Z-carboxylic acid methyl ester (75 mg, 0.186 mmol) in THF (2 ml) was added dropwise 1N NaOH (0.205 ml, 0.205 mmol) and the reaction mixture was stirred for 1.5 h. To the mixture was added 1N HCl (0.186 ml, 0.186 mmol) after stirring for 5 min toluene was added and the solvents were evaporated to provide the title compound together with sodium chloride as colorless solid. The mixture was used for ng reactions without further purification.

HPLC: RtH4= 0.89 min; ESIMS [M-BocT = 290.0; ’H-NMR (400 MHz, DMSO-de): 6 14.30 (br. s, 1H), 9.10 (s, 1H), 7.25 (t, 1H, CHF2), 1.33 (s, 18H).

Acid-10: 3-Amino(3-methoxy-propynyl)-pyridinecarboxylic acid a) 3-Amino(3-methoxy-propyny|)-pyridinecarboxylic acid methyl ester To a on of 3-methoxy-propyne (421 mg, 6 mmol), bis(triphenylphosphine)palladium(ll) chloride (84 mg, 0.12 mmol), copper(l) iodide (23 mg, 0.12 mmol) and NEt3 (1.17 ml, 8.4 mmol) in THF (10 ml) under Argon was added obromo-pyridine-2—carboxylic acid methyl ester (277 mg, 1.2 mmol) and the e was heated to 80 °C for 5 h. At 0 °C water (12 ml) was added and the mixture was extracted with EtOAc, the combined organic layers were washed with half-saturated aq. sodium chloride, dried with NaQSO4 and evaporated. The residue was purified by chromatography on silica gel (cyclohexane to cyclohexane/EtOAc 1:4) to provide the title compound as orange solid.

HPLC: RtH1= 0.67 min; ESIMS [M+H]+= 221.1; 1H—NMR (600 MHZ, DMSO-de): 6 7.85 (d, 1H), 7.33 ~ 7.22 (m, 1H), 6.77 (s, 2H), 4.35 (8, 2H), 3.80 (8, 3H), 3.33 (S, 3H). b) 3-Amino(3-methoxy-propynyl)-pyridinecarboxylic acid To a solution of 3-amino(3-methoxy-propyny|)-pyridinecarboxylic acid methyl ester (263 mg, 1.2 mmol) in THF (6 ml) was added 1N lithium hydroxide (1.32 ml, 1.32 mmol) at 0 °C and the e was stirred at room ature for 2 h. To the mixture was added 1N HCI (1.2 ml, 1.2 mmol) at 0 °C, after stirring for 5 min toluene was added and the solvents were evaporated to provide the title com pound together with lithium chloride as an off-white solid. The mixture was used for coupling reactions t further purification.

HPLC: RtH1= 0.45 min; ESlMS [M+H]+= 207.2; 1H-NMR (600 MHZ, DMSO-de): 6 7.84 (s, 1H), 7.30 (8, 1H), 6.92 (br. 8., 1H), 4.35 (8, 2H), 3.33 (S, 3H).

Acid-11: 3-Chloro-S-[3-(tetrahydro-pyran-Z-yloxy)-prop~1-ynyl)-pyridine—2-carboxylic acid The title compound was prepared by an analogous procedure to Acid-xx using 5-bromo—3— chloro—pyridinecarboxylic acid methyl ester instead of 3~amino—5-bromo—pyridine-2—carboxylic acid methyl ester and 2—prop—2-ynyloxy~tetrahydro—pyran instead of oxy—propyne [Acid-xx step 8)].

HPLC: RtH2= 0.68 min; ESIMS {M+H}+ = 296.1; 1H~NMR (400 MHz, DMSO-de): 6 14.02 (br. s, 1H), 8.65 (s, 1H), 8.26 (s, 1H), 4.84 (br. s, 1H), 4.66 - 4.36 (m, 2H), 3.85 - 3.64 (m, 1H), 3.58 - 3.41 (m, 1H), 1.80-1.61 (m,2H), 1.60 - 1.41 (m, 4H) Acid-12: 3-Chloro(3-methoxy-propynyl)-pyridinecarboxylic acid To a solution of 3-methoxy-propyne (421 mg, 6 mmol), bis(triphenylphosphine)palladium(II) de (84 mg, 0.12 mmol), copper(l) iodide (23 mg, 0.12 mmol) and NEt3 (1.17 ml, 8.4 mmol) in THF (10 ml) under Argon was added 3-chlorobromo-pyridine—Z-carboxylic acid methyl ester (284 mg, 1.2 mmol) and the e was heated to 80 °C for 5 h. At 0 °C water (12 ml) was added and the mixture was extracted with EtOAc. The aq. Phase was acidified to pH 1 by on of 1N HCI, extracted with DCM. The combined DCM extracts were washed with half- saturated aq. sodium chloride, dried with Na2804 and evaporated to provide the title compound as an off-white solid, which was used for coupling reactions without further purification.

HPLC: RtH1= 0.49 min; ESIMS [M+H]+= 226.3; 1H-NMR (600 MHZ, DMSO-ds): 6 14.02 (br. 3., 1H), 8.64 (S, 1H), 8.24 (s, 1H), 4.39 (S, 2H), 3.33 (8, 3H).

Acid-13: 3-Amino(3-hydroxy-propynyl)-pyridinecarboxylic acid a) 3-Amino[3-(tert-butyl-dimethyl-5i|anyloxy)—propyny|)-pyridinecarboxylic acid methyl ester The title compound was prepared by an ous procedure to Acid-1O using tert-butyl— dimethyl-prop-Z-ynyloxy-silane instead of 3-methoxy—propyne [Acid-1O step a)].

HPLC: RtH1= 1.23 min; ESIMS [M+H]+= 321.2; 1H-NMR (600 MHZ, DMSO-ds): 5 7.81 (8, 1H), 7.26 (d, 1H), 6.78 (br. 8, 2H), 4.57 (s, 2H), 3.79 (8, 3H), 0.89 (8, 9H), 0.12 (s, 6H). b) 3-Amino(3-hydroxy-propynyl)-pyridinecarboxylic acid methyl ester To a solution of 3—amino-5—[3—(tert—butyl-dimethyl-silanyloxy)-prop-1—yny|)—pyridinecarboxylic acid methyl ester (711 mg, 2.22 mmol) in DCM (6 ml) was added 102 ml TFA (133 mmol) at 0 °C and the e was stirred at room temperature for 17 h. To the mixture was added toluene (18 ml) and the solvents were ated. The residue was dissolved in EtOAc (66 ml) and washed with aq. 1M Nagcos solution, the aq. Phase was extracted back with EtOAc. The combined organic layers were washed with aturated aq. sodium chloride, dried with Na2804 and evaporated. The residue was purified by chromatography on silica gel (DCM to OH 94:6) to provide the title compound as an off—white solid.

HPLC: RtH1= 0.50 min; ESIMS [M+H]+ = 207.1; 1H—NMR (600 MHz, DMSO-de): 5 7.82 (s, 1H), 7.24 (s, 1H), 0.77 (br s, 2H), 5.43 (br. s, 1H), 4.32 (s, 2H). c) 3-Amino(3-hydroxy-propynyl)-pyridinecarboxylic acid To a solution of 3-amino(3-hydroxy—prop—1-ynyl)-pyridinecarboxylic acid methyl ester (297 mg, 1.44 mmol) in THF (10 ml) was added 1N lithium hydroxide and the mixture was vigorously stirred at room temperature for 4.5 h. To the mixture was added 4N HCl (0.47 ml, 1.87 mmol), after dilution with toluene the solvent was evaporated, the residue was suspended in toluene and evaporated (twice). The residue was suspended in TBME/hexane, filtered and the solid dried under reduced pressure at 50 °C to provide the title compound together with lithium chloride as a brown solid. The mixture was used for ng reactions without r purification.

HPLC: RtH5= 1.93 min; ESIMS [M+H]+ = 193.0; 1H-NMR (600 MHz, DMSO-da): 5 7.83 (s, 1H), 7.28 (s, 1H), 0.94 (br. s, 1H), 4.33 (s, 2H).

Acid-14: 3-Aminodifluoromethyl-pyridinecarboxylic acid a) 5-Difluoromethylnitro-pyridinecarboxylic acid tert-butyl ester The title compound was prepared by an analogous reaction ce to Acid-9 using o- 3—nitro-pyridinecarboxylic acid instead of 3-aminochloro-pyrazinecarboxylic acid methyl ester in step a) and omitting step b).

HPLC: RtH1= 1.07 min; ESlMS [M+H]+= 275.3; 1H-NMR (600 MHz, DMSO-ds): 6 9.18 (s, 1H), 8.82 (s, 1H), 7.31 (t, 1H, CHF2), 1.55 (s, 9H). b) 5-Difluoromethylnitro-pyridinecarboxylic acid In a mixture of 5 ml DCM and 2.5 ml TFA was ved 345 mg (1.26 mmol) 5-difluoromethyl nitro-pyridine-Z-carboxylic acid tert—butyl ester and the reaction mixture was stirred for 4 h.

Toluene was added and the solvents were evaporated to provide the title nd as colorless solid.

HPLC: RtH1= 0.31 min; ESIMS [2M-H]'= 435.3; 1H-NMR (600 MHz, DMSO-ds): 5 1459 (br. s, 1H), 9.16 (s, 1H), 8.80 (s, 1H), 7.31 (t, 1H, CHF2). c) 3-Aminodifluoromethyi-pyridinecarboxylic acid To a solution of 265 mg (1.22 mmol) 5-difluoromethylnitro-pyridinecarboxylic acid in EtOH was added 50 mg Raney—Nickel (Degussa B113W) and the reaction mixture was kept shaking under a hydrogen atmosphere for 16 h. The catalyst was filtered off (Celite) and washed with EtOH and the filtrate was evaporated to e the title compound as off-white solid.

HPLC: RtH1= 0.34 min; ESIMS [M+H]+ = 189.2; 1H-NMR (600 MHZ, e): 6 7.98 (s, 1H), 7.39 (s, 1H), 7.09 (t, 1H, CHF2), 7.02 (br. 8, 2H). : 3-Chloro-s-(2,2-difluoro-ethoxy)-pyridinecarboxyiic acid a) 3-Ch|oro(2,2-difluoro-ethoxy)—pyridinecarbonitrile To a solution of 3-chloro-5~hydroxy-pyridinecarbonitrile [12628607] (0.200 g, 1.23 mmol) in THF (15 ml) was added at 0 °C 2,2-difluoro-ethanol (0.123 g, 1.48 mmol) and triphenylphosphine (0.484 g, 1.84 mmol). After stirring for 10 min at 0 °C DlAD (0.373 g, 1.84 mmol) was added and the reaction mixture was stirred for 2 h at 0 °C followed by 16 h at 25 °C.

The reaction e was concentrated and the title compound was obtained after CombiFlash chromatography on silica gel (hexane/EtOAc 20:1 to 1:1) as a colorless oil.

TLC (hexane-EtOAc 1:1 ): Rf: 0.61; UPLC RtH5= 0.965 min; ESIMS: 217 [(M-H)‘]; 1H-NMR (400 MHz, CDCls): 5 8.31 (d, 1H), 7.32 (d, 1H), 6.12 (tt, 1H), 4.31 (dt, 2H). b) 3-Chloro(2,2-difluoro-ethoxy)-pyridine-Z-carboxylic acid PCT/IBZOIZ/054269 To a solution of 3-Ch|oro(2,2-difiuoro-ethoxy)-pyridinecarbonitrile (0.202 g, 0.878 mmol) in dioxane (4 ml) was added 4N NaOH (2.2 ml, 8,8 mmol) and the ing on mixture was stirred for 28 h at 85 °C. The reaction mixture was diluted with water and ted with EtOAc.

The aqueous phase was acidified with 4N HCl and evaporated to s. The title compound was extracted with DCM/MeOH (9/1), pushed through a plug of Celite and was obtained after evaporation as a light yellow solid.

UPLC RtH6= 0.655 min; ESlMS: 236 [(M-H)']; ‘H-NMR (400 MHz, cosoo): 5 8.31 (d, 1H), 7.68 (d, 1H), 6.23 (tt, 1H), 4.44 (dt, 2H); 19F-NMR (400 MHz, coaoo) 128.0 (dt, 2F).

Acid-16: 3-Chlorofluoromethoxy-pyridinecarboxylic acid a) 2,3-Dich|orofluoromethoxy-pyridine To a solution of 5,6-dichloro—pyridinol [118609} (500 mg, 3.05 mmol) and K2C03 (632 mg, 4.57 mmol) in dry ACN (12 ml) was added fiuoro-iodomethane (1.156 ml, 9.15 mmol) at 0 °C.

The light yellow sion was stirred for 5 min at 0 °C and then heated up to 120 °C for 30 min. Saturated aq. NH4Cl was added, followed by EtOAc. The organic layer was ted and the aqueous layer was extracted twice with EtOAc. The combined organic layers were washed with brine, dried with NaZSO4, filtered and evaporated to give a brown oil. The crude material was directly used in the next step without further purification.

HPLC: RtH2= 0.95 min; ESlMS [M+H}+ = 198.1; ‘H-NMR (400 MHz, DMSO—ds): 5 8.31 (dd, 1H), 8.07 (d, 1H), 6.05 (s, 1H), 5.91 (s, 1H). b) 3-Ch|orofluoromethoxy-pyridine-Z-carbonitrile To a solution of chlorofluoromethoxy~pyridine (1.18 g, 6.02 mmol) in dry DMF (14.00 ml) were added Zinc cyanide (0.341 g, 2.90 mmol) and Zinc powder (3.94 mg, 0.060 mmol). The suspension was flushed with Argon (3x). Then tetrakis(triphenylphosphine)palladium(0) (0.570 g, 0.494 mmol) was added. The reaction was heated to 145 °C for 2 h. Water was added and the aqueous layer was extracted twice with EtZOThe combined organic layers were washed with brine, dried with Na2804, filtered and evaporated. The residue was purified by chromatography on silica gel (cyclohexane to cyclohexane/EtOAc 7:3) to provide the title compound as yellow oil (515 mg).

HPLC: R1,”: 0.81 min; ESlMS [M+H]+= 187.0; 1H-NMR (400 MHz, DMSO—ds): 5 8.61 (s, 1H), 8.16 (s, 1H), 6.15 (s, 1H), 6.02 (s, 1H).

PCT/132012/054269 c) 3-Chlorofluoromethoxy-pyridine-Z-carboxylic acid To a solution of rofluoromethoxy—pyridinecarbonitrile (80 mg, 0.429 mmol) in EtOH (2.4 ml) was added 1M NaOH (1.21 ml, 1.201 mmol) and the resulting solution was stirred at 70 °C over night. To complete the reaction, more 1M NaOH (1.2 ml, 1.201 mmol) was added and the reaction was stirred at 70 °C for 8 h. More 1M NaOH (1.2 ml, 1.201 mmol) was added and the reaction was stirred over night. Then 1M HCI (3.45 ml, 3.45 mmol) was added. The aqueous layer was extracted twice with EtOAc. The combined organic layers were dried with N32804, filtered and evaporated to give a light pink solid. Mixture of 80 mg, 35% of 3-chloro~5~ ethoxy—pyridine~2—carboxylic acid, 38% of roethoxy-pyridine—2—carboxylic acid. 3-Chlorofluoromethoxy-pyridine—2-carboxylic acid: HPLC: RtH2= 0.42 min; ESlMS [M+H]+ = 206.1; 1H—NMR (400 MHz, DMSO-de): 6 13.36 (br. s, 1H), 8.29 (d, 1H), 7.66 (d, 1H), 6.09 (s, 1H), 5.96 (s, 1H). 3-Chloroethoxy-pyridine-2—carboxylic acid: HPLC: RtH2= 0.59 min; ESIMS [M+H]+ = 202.1; 1H—NMR (400 MHz, DMSO-de): 6 13.66 (br. s, 1H), 8.45 (d, 1H), 8.29 (d, 1H), 4.21 (q, 2H), 1.36 (t, 3H).

The crude mixture of acids was used for the couling reaction without further purification.

Acid-17: o-S-(2-methoxy-ethyl)-pyrazinecarboxylic acid a) 3-Amino((Z)ethoxy-vinyl)-pyrazinecarboxylic acid methyl ester A mixture of 3—amino—5-chloro-pyrazine—Z—carboxylic acid methyl ester [28643-16—5] (2 g, 10.66 mmol), lithium chloride (1.582 g, 37.3 mmol), Pd(PPh3)ZCl2 (0.748 g, 1.066 mmol) and tributyl- -ethoxy-vinyl)-stannane (6.42 ml, 19.19 mmol) in DMF (104 ml) under argon was heated at 80 °C bath temperature for 1.5 h. A saturated. aq. NH4C| was added and the mixture was extracted with MTBE, then once with THF 3/ 1. The combined organic layer was washed with brine, dried with N32804, filtered and concentrated under reduced pressure. The residue was purified by chromatography on silica gel (cyclohexane to cyclohexane/EtOAc 1:9) to provide the title compound as yellow oil (1.96 g).

HPLC: RtH2= 0.69 min; ESlMS [M+H]* = 225.1; ‘H-NMR (400 MHz, DMSO-ds): 6 8.42 (s, 1H), 7.18 (br. s, 2H), 6.88 (d, 1H), 5.23 (d, 1H), 4.15 (q, 2H), 3.82 (s, 3H), 1.32 (t, 3H).

PCT/IBZOlZ/054269 b) 3-Amino(2,2-dimethoxy-ethyl)-pyrazinecarboxylic acid methyl ester A solution of 3-amino((Z)ethoxy—vinyl)-pyrazinecarboxylic acid methyl ester (220 mg, 0.986 mmol) in 3M HCl in MeOH (210 pl, 6.90 mmol) was heated at 55 °C over night. A on of 10% of NaHC03 was added the mixture was extracted with EtOAc. The combined organic layer was dried with Na2804, filtered and concentrated under reduced pressure to obtain a brown soild (141 mg). The crude material was directly used in the next step without further purification.

HPLC: Rtm= 0.59 min; ESIMS [M+H]+ = 242.2. c) o(2-methoxy-vinyl)-pyrazinecarboxylic acid methyl ester To a on of 3-amino(2,2-dimethoxy~ethyl)-pyrazine~2~carboxylic acid methyl ester (300 mg, 1.244 mmol) and EtsN (1.213 ml, 8.70 mmol) in DCM (10 ml) at -10 °C was added dropwise timethylsilyl trifluoromethanesulfonate (0.809 ml, 4.48 mmol). The reaction mixture was stirred at room temperature for 100 min. A saturated solution of NaHCOa was added and the mixture was extracted twice with DCM. The combined c layers were washed with NH4Cl solution and brine, dried with N32804, filtered and concentrated under d pressure to obtain a brown oil (560 mg). The resulting crude material (mixture of E and Z) was directly used in the next step without further ation.

HPLC: Rtm: 0.63 min; ESIMS [M+H]”= 210.1. d) 3-Amino(2-methoxy-ethyl)-pyrazinecarboxylic acid methyl ester A solution of 3-amino—5-(2—methoxy-vinyl)—pyrazine-2—carboxylic acid methyl ester (260 mg, 1.24 mmol) and Pd/C 10% (50mg) in EtOH (10 ml) was stirred at rt and under an atmosphere of hydrogen for 17 h. To complete the reaction, more Pd/C 10% (84 mg) was added and the reaction was stirred under an atmosphere of hydrogen for 37 h. The suspension was filtered off and washed with EtOH and then residual solution was evaporated. The residue was purified by chromatography on silica gel (DCM to DOM/MeOH 9:1) to provide the title compound as yellow solid (147 mg).

HPLC: RtH2= 0.54 min; ESIMS = 212.2; 1H-NMR (400 MHz, DMSO-de): 6 7.84 (s, 1H), 7.31 (br. s, 2H), 3.83 (s, 3H), 3.68 (t, 2H), 3.23 (s, 3H), 2.87 (t, 3H). e) 3-Amino(2-methoxy-ethyl)-pyrazinecarboxylic acid To a solution of 3-amino-5—(2-methoxy—ethyl)-pyrazinecarboxylic acid methyl ester (147 mg, 0.696 mmol) in THF (14 ml) was added 1M NaOH (1.74 ml, 1.74 mmol) and the reaction mixture was stirred at room ature for 2 h. 1M HCI (1.601 ml, 1.601 mmol) was added to the reaction mixture. The resulting mixture was evaporated and co-evaporated with toluene. The resulting crude material was directly used in the coupling step without further purification.

HPLC: RtH2= 0.41 min; ESlMS [M+H}+ = 198.1; 1H-NMR (400 MHz, DMSO-de): 6 7.68 (s, 1H), 7.62 (br. s, 2H), 3.65 (t, 2H), 3.23 (s, 3H), 2.81 (t, 3H).

Acid-18: 3-Aminochloro(1,1-difluoro-ethyl)-pyrazinecarboxylic acid a) ochloro(1-ethoxy-vinyl)-pyrazinecarboxylic acid methyl ester A mixture of 3-amino-5,6-dichloro-pyrazine-Z-carboxylic acid methyl ester [14580] (600 mg, 2.62 mmol), lithium chloride (389 mg, 9.17 mmol), Pd(PPh3)2Cl2 (184 mg, 0.262 mmol) and tributyl-(1-ethoxy-vinyl)—stannane [976747] (1.6 ml, 4.50 mmol) in DMF (27 ml) under argon was heated at 80 °C bath temperature for 3 h and 50 min. ted aq. NH4C| was added and the e was extracted with MTBE (3x). The combined organic layers were washed with brine, dried with N92804, filtered and concentrated under d pressure. The residue was purified by chromatography on silica gel hexane to cyclohexane/EtOAc 7:3) to provide the title compound as yellow solid (433 mg).

HPLC: RtH2= 0.94 min; ESlMS [M+H}* = 258.1; ‘H—NMR (400 MHz, DMSO—o‘e): 6 7.59 (br. s, 2H), 4.64 (d, 1H), 4.58 (d, 1H), 3.91 (q, 3H), 3.86 (s, 3H), 1.81 (t, 2H). b) 5-AcetyIaminochIoro-pyrazine-Z-carboxylic acid methyl ester A solution of 3-aminochloro(1-ethoxy—vinyl)—pyrazinecarboxylic acid methyl ester (46 mg, 0.190 mmol) and para-toluenesulfonic acid monohydrate (73.8 mg, 0.388 mmol) in THF (2.85 ml) was stirred at rt for 1 h. Saturated aq. NaHCO3 was added and the mixture was extracted twice with DCM. The combined organic layers were washed with brine, dried with Na2804, filtered and concentrated under reduced pressure to obtain a yellow solid (46 mg). This material was used for the next step without further purification.

HPLC: RtH2= 0.73 min; ESIMS [M+H]+ = 230.1; 1H—NMR (400 MHz, DMSO—de): 6 7.70 (br. S, 2H), 3.83 (s, 3H), 2.58 (s, 3H). c) 3-Aminochloro(1,1-difluoro-ethyl)-pyrazinecarboxylic acid methyl ester To a cloudy yellow solution of 5-acetylaminochloro-pyrazine-Z-carboxylic acid methyl ester (178 mg, 0.775 mmol) in dry DCM (7.75 ml) was added Deoxofluor 50% in e (858 pl, 2.326 mmol). The reaction was stirred at rt over the weekend. More Deoxofluor 50% in toluene was added (six times 858 pL, 2.326 mmol) within 3 days to complete the reaction. Saturated aq.

NaHCOa was added and the mixture was extracted twice with EtOAc. The combined organic layers were washed with aq. citric acid, dried with Na2804, filtered and concentrated under reduced pressure. The e was purified by chromatography on silica gel (cyclohexane to cyclohexane/EtOAc 7:3) to provide the title compound as yellow solid (136 mg).

HPLC: RtH2= 0.91 min; ESIMS [M+H]+ = 252.1; 1H-NMR (400 MHz, DMSO-de): 5 7.75 (br. s, 2H), 3.88 (s, 3H), 2.02 (t, 3H). d) 3-Aminochloro(1,1-difluoro-ethyl)—pyrazinecarboxylic acid To a solution of 3-aminochloro(1,1-difluoro—ethyl)—pyrazinecarboxylic acid methyl ester (136 mg, 0.541 mmol) in THF (5.40 ml) was added 1M LiOH (595 pl, 0.595 mmol) at 0 °C. The resulting brown solution was warmed up to rt for 5 h. More 1M LiOH (95 pl, 0.095 mmol) was added at 0 °C and the reaction was stirred at rt for 1 h. Then 1M HCI (632 pl, 0.632 mmol) was added and then the resulting mixture was evaporated to dryness. The resulting crude material was ly used in the coupling step without further purification.

HPLC: RtH2= 0.63 min; ESIMS [M+H]+ = 238.1; 1H-NMR (400 MHz, DMSO—de): 6 13.69 (br. s, 1H), 7.75 (br. s 2H), 2.02 (t, 3H).

Acid-19: 3-Chloro(1,1-dif|uoro-ethy|)-pyridine—2-carboxylic acid a) 3-Chloro(1-ethoxy—vinyl)-pyridinecarboxylic acid methyl ester To a solution of 5—bromo—3—chIoro-pyridine—2-carboxylic acid methyl ester [14580] (376 mg, 1.5 mmol) in dioxane (3.7 ml) was added tributyl~(1~ethoxy~vinyI)—stannane 7] (596 mg, 1.65 mmol), the solution was ed and flushed with nitrogen (3x), Pd(PPh3)4 (87 mg, 0.075 mmol) was added, after ing and flushing with nitrogen the mixture was heated to reflux for 4 h. The reaction mixture was diluted with EtOAc and treated with 10% aq. KF, the precipitate was filtered off and the layers were separated. The aq. Phase was extracted with EtOAc, the ed organic layers were washed with sat. aq. NaCl, dried with M9804, ed and concentrated under reduced pressure. The residue was purified by chromatography on silica gel (cyclohexane/EtOAc 12:1 to 6/1) to provide the title compound as yellow solid.

HPLC: RtH7= 2.822 min; ESIMS [M+H]+= 2420/2440; 1H-NMR (600 MHz, DMSO-de): 5 8.91 - 8.78 (m, 1H), 8.29 - 8.18 (m, 1H), 5.19 (d, 1H), 4.60 (d, 1H), 3.93 (q, 2H), 3.92 (s, 3H), 1.37 (t, 3H). b) ylchloro-pyridinecarboxylic acid methyl ester To a solution of 3—chloro(1-ethoxy—vinyl)-pyridinecarboxylic acid methyl ester (359 mg, 1.485 mmol) in THF (3.6 ml) was added para-toluenesulfonic acid monohydrate (565 mg, 2.97 mmol) and the mixture was stirred for 1 h. The reaction mixture was diluted with TBME and sat. aq. NaHCOa, the layers were separated and the aq. Phase was ted with TBME. The combined organic layers were washed with sat. aq. NaHCOs and sat. aq. NaCl, dried with MgSO4, filtered and concentrated under reduced re. The residue was purified by chromatography on silica gel (cyclohexane/EtOAc 9:1 to 6/1) to provide the title compound as yellow solid.

HPLC: RtH8= 2.604 min; ESIMS [M+H]+= 2140/2160; 1H-NMR (600 MHZ, DMSO—de): 6 9.17 - 8.99 (m, 1H), 8.63 - 8.46 (m, 1H), 3.96 (s, 3H), 2.69 (8, 3H). c) 3-Chloro(1,1-difluoro-ethyl)-pyridinecarboxylic acid methyl ester To a solution of 5-acetyl-3—chloro-pyridinecarboxylic acid methyl ester (278 mg, 1.30 mmol) in DCM (2.8 ml) was added Deoxofluor® (50 w-% in e, 1.44 ml, 3.9 mmol) and the reaction mixture was stirred protected from sunlight at rt for 6 h, more Deoxofluor® (50 w-% in e, 1.44 ml, 3.9 mmol) was added and the mixture was stirred over night. The reaction mixture was poured on cold sat. aq. NaHCO3 g gas evolution), TBME was added and the layers were separated. The aq. phase was extracted with TBME, the combined TBME layers were washed with sat. aq. NaHCOs, sat. aq. NaCl, dried with M9804, filtered and evaporated. The residue was purified by chromatography on silica gel (cyclohexane/EtOAc 95:5 to 93/7) to provide the title compound as colorless oil.

HPLC: RtH8= 3.140 min; ESIMS [M+H]+ = 2380/2380; 1H—NMR (600 MHz, g): 5 8.84 (s, 1H), 8.40 (s, 1H), 3.95 (s, 3H), 2.07 (t, 3H). d) 3-Chloro(1,1-difluoro-ethyl)-pyridinecarboxylic acid To a solution of 3-chloro(1,1-difluoro-ethyl)-pyridinecarboxylic acid methyl ester (272 mg, 1.154 mmol) in THF (6 ml) was added LiOH (30.4 mg, 1.27 mmol) in water (0.5 ml) and the mixture was stirred for 3.5 h. To the mixture was added 6N HCI (0.212 ml, 1.27 mmol) and the WO 27188 PCT/IBZOIZ/054269 solvent was evaporated. The residue was taken up in toluene and evaporated (2x) to provide the title compound as colorless solid together with LiCl. This material was directly used in the coupling step without further purification.

HPLC: RtH5= 2743 min; ESIMS [M+H]+ = 2220/2240; 1H-NMR (600 MHz, DMSO-de): 6 8.76 (s, 1H), 8.29 (s, 1H), 3.37 (br. s, 1H), 2.06 (t, 3H).

Claims (18)

What is claimed is

1. A compound of formula (I), or a pharmaceutically acceptable salt thereof, (1), wherein R1 and R2 are independently hydrogen or halogen; R3 and R4 are independently en or C1-3alkyl; or R3 and R4 taken together are cyclopropyl; or R1 and R4 are hydrogen and R2 and R3 taken together are -CH2-O—CH2—; R5 is C1_3alkyl, halogen—01-3alkyl or C1_3alkoxy—C1_3alkyl; and R6 is phenyl or a 5- or 6—membered monocyclic heteroaryl comprising 1, 2, 3 or 4 heteroatoms 10 independently selected from N, O and S, and wherein said phenyl or heteroaryl is optionally tuted by 1, 2, 3 or 4 substituents independently ed from halogen, cyano, amino, hydroxy, kyl, halogen-C1.4alkyl, halogen-C1-4alkylthio, halogen-C1.4alkoxy, xy, C1- 4alkoxy-C1_4alkyl, C1-4alkoxy-C1-4alkoxy, CMalkoxy-C1_4alkylthio, C1_4a|koxy—Cz_4alkenyl, C1- 4alkoxy-C2_4alkynyl, hydroxy-C1-4alky|, hydroxy-C2.4alkenyl and hydroxy-Cz.4alkynyl. 15

2. A compound according to Claim 1, or a pharmaceutically acceptable salt thereof, wherein R1 and R2 are both fluoro.

3. A compound according to Claim 1 or Claim 2, or a pharmaceutically acceptable salt thereof, wherein R3 and R4 are both hydrogen.

4. A compound according to any one of Claims 1 to 3, or a ceutically acceptable 20 salt thereof, n R5 is methyl.

5. A compound according to any one of Claims 1 to 4, or a pharmaceutically acceptable salt thereof, wherein R6 is a 6—membered monocyclic heteroaryl comprising 1, 2, 3 or 4 heteroatoms independently selected from N, O and S, and wherein said aryl is optionally substituted by 1, 2, 3 or 4 tuents independently selected from halogen, cyano, amino, 25 hydroxy, C1_4alkyl, halogen-C1-4alkyl, halogen-C1_4alkylthio, halogen-C1.4alkoxy, C1.4alkoxy, C1- 4alkoxy-C1_4alkyl, koxy-C1_4a|koxy and C1.4alkoxy-C1_4alkylthio.

6. A compound according to any one of Claims 1 to 4, or a pharmaceutically acceptable salt thereof, wherein R6 is a pyridinyl group which is tuted by 2 substituents and n one of the substituents is located at the para position and one of the substituents is located at the ortho position of the pyridin-Z-yl group relative to the amide linker and wherein the substituents are independently selected from n, cyano, amino, hydroxy, methyl, trifluoromethyl, methoxy and trifluoromethoxy.

7. A compound according to Claim 1 which is selected from: 3—Chlorocyano-pyridinecarboxylic acid [6-((R)—2-amino-5,5—difluoro—4—methyl—5,6-dihydro- 4H-[1,3] oxazin-4—yl)fluoro~pyridin—2-yl]-amide; 10 3—Chloro-5—cyano-pyridine—2—carboxylic acid [6~((R)-2—amino-5,5—difluoro-4,6,6-trimethyl-5,6~ dihydro-4H-[1,3] oxazin-4—yl)fluoro-pyridin~2~yl]~amide; omethyl-pyridinecarboxylic acid {6-[(R)—2—amino-5,5-difluoro-4—(2-methoxy—ethyl)- 5,6—dihyd ro-4H-[1 ,3]oxaziny|]fluoro-pyridin—2-y|}-amide; 3-Chloro-5—trifluoromethyI-pyridine-Z-carboxylic acid {6-[(R)—2—aminc-5,5-difluoro-4—(2—methoxy— 15 -5,6-dihydro-4H-[1 ,3]oxazln-4—yl]fluoro-pyridiny|}-amide; 3-Amino—5-trifluoromethyl-pyrazine—2—carboxylic acid [6-((R)—2-amino—5,5-difluoromethyI-5,6- dihyd ro-4H-[1 ,3]oxazin-4—yl)fluoro—pyridinyl]-amide; 3,5-Dichloro-pyridine-2—carboxylic acid [6-((R)—2—amino-5,5—difluoro—4—methyl-5,6-dihydro-4H- [1 ,3}oxazinyl)—5—fluoro-pyridin-2—yl]-amide; 20 3—Amino-5—(2,2,2-trifluoro-ethoxy)pyrazinecarboxylic acid [6-((R)-2—amino-5,5—difluoro methyl-5,6—dihydro-4H-[1,3]oxazin-4—yl)—5-fluoro—pyridin-2~yl]~amide; 3—Amino(2,2-dif|uoro-ethoxy)-pyrazine-2—carboxylic acid )—2-amino~5,5-difluoro-4— methyl—5,6—dihydro—4H-[1,3]oxazin-4—yl)fluoro-pyridin-Z-yl]~amide; 3~Amino(3-fluoro—propoxy)—pyrazine—2-carboxylic acid [6-((R)amino-5,5-difluoro-4—methyl— 25 5,6—dihydro-4H-[1,3]oxazin-4—yl)-5—f|uoro-pyridin-2—yl]-amide; 5-Methoxy—3-methyl-pyridinecarboxylic acid [6-((R)—2-amino-5,5-difluoro-4—methyl-5,6- dihydro-4H-[1,3]oxazinyl)f|uoro-pyridin-Z-yl1-amide; 3-Amino(3-methoxy—propynyi)—pyridine-Z-carboxylic acid [6—((R)—2—amino-5,5—difluoro-4— -5,6-dihyd ro-4H-[1 ,3]oxazinyi)fiuoro-pyridinyl]-amide; 3—Amino—5-fluoromethoxy—pyrazine—2—carboxyiic acid [6-((R)—2—amino—5,5—diflu0romethyI-5,6- dihydro-4H-[1,3]oxazin-4—yl)f|uoro-pyridin-2—yl]—amide; 3-Amino—5-(2—methoxy-ethoxy)—pyrazine—2~carboxylic acid [6-((R)-2—aminc-5,5-difluor0-4—methyi- 5,6-dihydro—4H-[1,3]oxazin-4—yl)—5-fluoro—pyridiny|]-amide; 3-Amino—5—(3-hydroxy—prop—1~yny|)—pyridine—2-carboxylic acid [6-((R)amino—5,5—diflu0ro—4— methyl-5,6-dihydro—4H-[1 ,3]oxazin—4-yl)—5—fiuoro—pyridinyl]-amide; 3-Amino-S-fluoro-pyridine-Z-carboxyiic acid [6~((R)aminc-5,5-difluoro-4—methyi-5,6—dihydro- 10 4H-[1 ,3]oxazin—4—yI)-5—fiuoro-pyridin-2—yI]—amide; 3—Amino—5-chloro-pyridine—2-carboxylic acid [6-((R)—2—amino—5,5-difiuoro—4-methyi-5,6-dihydro— 4H—[1 ,3]oxazinyI)fluoro-pyridin—2-yI]-amide; 3-Chloro—pyridine—2—carboxylic acid[6-((R)amino—5,5-difluoro-4—methyl-5,6—dihydro-4H- [1 ,3]oxazinyl)f|uoro-pyridinyi]-amide; 15 3—Chloro—5—(3-methoxy-prop—1—yny|)pyridine-2—carboxylic acid [6—((R)—2—amino-5,5-difluor0-4— methyl-5,6—dihydro—4H-[1 ,3]oxazin-4—yl)—5-fluoro—pyridin—Z-yi]-amide; 3-Amino—5—difluoromethyi-pyrazine—2-carboxylic acid )—2—amino-5,5—difluoro-4—methyI—5,6~ dihyd [1 ,3]oxazin—4—yl)-5—fiuoro—pyridinyi]-amide; 3-Amino—5—(2-ch|oro-ethoxy)-pyrazine—2—carboxylic acid [6-((R)—2—amino-5,5-difluoro-4—methyi- 20 5,6~dihyd r0-4H-[1 ,3]oxazin—4—yi)-5—fiuoro—pyridin-2—yi1-amide; 3-Chioro—5-(2,2-difluoro-ethoxy)-pyridine—2—carboxylic acid [6-((R)-2—amino-5,5-difiuoro-4— —5,6-dihydro-4H—[1,3]oxazin-4—yi)—5—fiuoro—pyridinyi}-amide; 3-Amino(2—fiuoro-ethoxy)-pyrazine-2—carboxylic acid [6—((R)-2—amino—5,5-difluor0methyi- 5,6-dihyd ro—4H-[1 ,3]oxazin-4—yi)—5-fiuoro-pyridin-2—yi]—amide; 25 3-Chloro—5-fluoromethoxy—pyridine-Z-carboxylic acid [6-((R)—2—amino—5,5-dif|uoromethyi-5,6- dihydro-4H-[1,3]oxaziny|)fiuor0-pyridinyi]-amide; 3-Chloroethoxy—pyridinecarboxylic acid )—2-aminc-5,5-difluoro-4—methyl-5,6-dihydro- 4H-[1 ,3]oxazin-4—yl)fluoro-pyridinyl]-amide; 3-Amino(penta—deuter0-ethoxy)-pyrazine-2—carboxylic acid [6-((R)-2—amino—5,5-difluoro-4— methyl-5,6—dihydro-4H—[1 ,3]oxazin-4—yl)fluoro-pyridinyl]-amide; 3-Amino—5—(2—methoxy—ethyl)-pyrazine~2—carboxylic acid )aminc-5,5-difluoro—4—methyl— 5,6-dihyd ro-4H—[1 ,3]0xazin-4—yl)fluoro-pyridin~2—yl}-amide; 4—Chloro—1~difluoromethyI—1H—pyrazole-B-carboxylic acid [6—((R)—2-amino—5,5~difluoro—4—methyl- 5,6~dihydro-4H—[1,3]oxazin-4—yl)f|uoro-pyridin—2—yl]—amide; 3—Amino-pyrazine—Z-carboxylic acid [6-((R)—2-amino-5,5—difluoro-4—methyl-5,6—dihydro—4H— 10 [1 ,3]oxazin-4—yl)—5—fluoro-pyridin—2—yl]~amide; 3-Chioro(3-hydroxy-propyny|)—pyridine—2—carboxylic acid [6-((R)amino-5,5-difluoro methyl—5,6-dihydro~4H—[1,3]oxazin-4—yl)fluoro—pyridin-2—yl]-amide; 3-Amino—5—difluoromethyI-pyridinecarboxylic acid [6-((R)—2-amino-5,5-difluoro-4—methyI-5,6— dihydro-4H-[1,3]oxazin-4—yl)fluoro-pyridinyl]-amide; 15 3-Amino-6—chloro-5—(1,1-dif|uoro-ethyl)—pyrazinecarboxylic acid )-2—amino—5,5-difluoro- 4—methyl-5,6-dihydro-4H-[1,3]oxazin-4—yl)—5-fluoro—pyridin-2—yI]-amide; 5-Cyano-pyridinecarboxylic acid [6—((R)-2~amino-5,5-difluoro-4—methyl—5,6—dihydro-4H~ [1 ,3]oxazin—4—yl)-5—f|uoro-pyridin-2—yl]-amide; 3—Chl0ro(1,1-difluoro-ethyl)—pyridine—2—carboxylic acid [6—((R)-2—amino-5,5-difluoro~4-methyl- 20 5,6—dihydro-4H-[1,3]oxazin—4—yl)—5-f|uoro-pyridin—2-yl]-amide; and 3-Amino—5-(1,1-difluoro—ethyl)-pyrazine-2—carboxylic acid [6~((R)aminc-5,5-difluoromethyl— 5,6-dihyd ro—4H—[1 ,3]oxazin-4—yl)fluoro—pyridin-2—yl]-amide; and pharmaceutically able salts f.

8. A compound according to Claim 1 which is 5-cyanomethyl—pyridinecarboxylic acid 25 [6-((R)-2—amino-5,5-difl uoromethyI-5,6-dihydro-4H-[1 ,3] oxazin-4—yl)—5-fluoro-pyridin-Z-yl]- amide, or a pharmaceutically acceptable salt thereof, having the following chemical structure

9. A compound according to Claim 1 which is rotrifluoromethyl-pyridine—Z- carboxylic acid [6—((R)—2-amino—5,5-difluoro—4-methyl-5,6-dihydro-4H-[1,3]oxazin—4—yl)-5—fluoropyridin-Z-yl e, or a pharmaceutically acceptable salt thereof, having the following chemical structure F \

10. A pharmaceutical composition comprising a nd according to any one of Claims 1 to 9, or a pharmaceutically acceptable salt f, as active pharmaceutical ingredient in association with at least one pharmaceutically acceptable carrier or t. 10

11. Use of a compound according to any one of Claims 1 to 9, or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament.

12. Use of a compound according to any one of Claims 1 to 9, or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for the treatment or prevention of Alzheimer’s Disease or mild ive impairment. 15

13. A combination comprising a therapeutically effective amount of a compound according to any one of Claims 1 to 9, or a pharmaceutically acceptable salt thereof, and a second drug sub- stance, for simultaneous or sequential administration.

14. A compound according to Claim 1, substantially as herein described with reference to any one of the Examples thereof. 20

15. A compound according to any one of Claims 1 to 9, substantially as herein described.

16. A pharmaceutical composition ing to Claim 10, substantially as herein described.

17. Use according to Claim 11 or 12, ntially as herein described.

18. A combination according to claim 13, substantially as herein described.