JP6440250B2 - Thiamide derivative - Google Patents
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Description
本発明は、汎用性の高い官能基を導入したクリック反応に有用なチオアミド誘導体に関する。 The present invention relates to a thioamide derivative useful for a click reaction in which a highly versatile functional group is introduced.
高い反応性・選択性を持った反応で比較的単純な小分子パーツを多様に組み合わせ、新たな機能性分子を創出する鍵反応をクリック反応と総称し、バリー・シャープレスによって提案された。 A key reaction to create new functional molecules by combining various relatively simple small molecule parts with highly reactive / selective reactions, collectively called click reactions, and was proposed by Barry Sharples.
クリック反応は、生体直交性(通常は生体分子の構造中にない官能基の組み合わせで、これらが互いに選択的に反応しかつ、そのことが他の内因性分子には影響を与えない化学的性質)を持つ代表的な反応であり、生体に緩和な条件で新たな化学結合を導入することができるため、細胞表面の生体分子を特異的に蛍光可視化する等の高度な技術に応用されている(非特許文献1)。
アミド結合形成反応としての Staudinger 反応(非特許文献2)や、アシルスルホンアミド結合形成反応としての Sulfo Click 反応(非特許文献3)なども、生体直交性を有するクリック反応の例として挙げられる。
Click reaction is a bio-orthogonal (chemical property that is a combination of functional groups that are not normally in the structure of a biomolecule, which react selectively with each other and do not affect other endogenous molecules). ) And can introduce new chemical bonds into the living body under mild conditions, so it has been applied to advanced technologies such as specific fluorescence visualization of biomolecules on the cell surface. (Non-Patent Document 1).
Staudinger reaction (Non-patent document 2) as an amide bond forming reaction and Sulfo Click reaction (Non-patent document 3) as an acylsulfonamide bond forming reaction are also examples of click reactions having bioorthogonality.
発明者らは、チオアミドとスルホニルアジドが効率よく結合を形成する新規クリック反応を開発した(非特許文献4)。この反応は、様々な溶媒中で反応が進行し、中でも水中で最も効率よい有用な反応である。
しかし、この反応に用いる市販のチオアミドの種類は少なく、また、ローソン試薬などのチオ化剤によるチオアミド化が利用できるものの汎用性の高いチオアミド誘導体が求められている。
The inventors have developed a novel click reaction in which a thioamide and a sulfonyl azide efficiently form a bond (Non-patent Document 4). This reaction proceeds in various solvents and is the most efficient and useful reaction in water.
However, there are few types of commercially available thioamides used in this reaction, and there is a demand for highly versatile thioamide derivatives although thioamidation with a thioating agent such as Lawesson's reagent can be used.
添加剤が不要で、温和な条件下に水溶液でも進行する汎用性の高い生体直交型の新規クリック反応に使用されるチオアミドとして、下記のチオアミド誘導体を開発した。
以下に本発明を詳細に説明する。
The following thioamide derivatives have been developed as thioamides that can be used for highly versatile bio-orthogonal novel click reactions that do not require additives and proceed even in aqueous solution under mild conditions.
The present invention is described in detail below.
本発明において、アルキル基とは、メチル、エチル、プロピル、イソプロピル、ブチル、イソブチル、tert-ブチル、ペンチルおよびヘキシル基などの直鎖状または分岐鎖状のC1−6アルキル基;カルバメート系保護基とは、tert-ブトキシカルボニル基(Boc)、ベンジルオキシカルボニル基(ZまたはCbz)、9-フルオレニルメチルオキシカルボニル基(Fmoc)、2,2,2-トリクロロエトキシカルボニル基(Troc)、アリルオキシカルボニル基(Alloc)などの基;カルボキシル基の活性された基とは、スクシンイミド、マレイイミドなど環状イミドを有するカルボキシル基およびハロゲン(フルオロ、クロロ、ブロモなど)化剤で誘導された基などを意味する。 In the present invention, the alkyl group means a linear or branched C 1-6 alkyl group such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl and hexyl groups; And tert-butoxycarbonyl group (Boc), benzyloxycarbonyl group (Z or Cbz), 9-fluorenylmethyloxycarbonyl group (Fmoc), 2,2,2-trichloroethoxycarbonyl group (Troc), allyl A group such as an oxycarbonyl group (Alloc); an activated group of a carboxyl group means a carboxyl group having a cyclic imide such as succinimide and maleimide, and a group derived from a halogen (fluoro, chloro, bromo, etc.) agent. To do.
本発明の第1の発明は、以下のチオアミド誘導体である。
「式中、R1は、アルキル基を;R3は、水素原子またはカルバメート系保護基を、naは、1〜6の整数を、それぞれ意味する」 “In the formula, R 1 represents an alkyl group; R 3 represents a hydrogen atom or a carbamate-based protecting group, and na represents an integer of 1 to 6”.
R1のアルキル基として好ましいものは、メチル基である。
カルバメート系保護基として好ましいものは、tert-ブトキシカルボニル基(Boc)である。
naとして好ましいものは整数の2である。
A preferable alkyl group for R 1 is a methyl group.
A preferred carbamate protecting group is a tert-butoxycarbonyl group (Boc).
An integer of 2 is preferable as na.
本発明の第2の発明は、以下のチオアミド誘導体である。
「式中、R1は、アルキル基を;R3は、水素原子またはカルバメート系保護基を、nbは、1〜6の整数を、mは、1〜2の整数を、それぞれ意味する。」 “In the formula, R 1 represents an alkyl group; R 3 represents a hydrogen atom or a carbamate protecting group, nb represents an integer of 1 to 6, and m represents an integer of 1 or 2.”
R1のアルキル基として好ましいものは、メチル基である。
カルバメート系保護基として好ましいものは、tert-ブトキシカルボニル基(Boc)である。
nbとして好ましいものは整数の2である。
mとして好ましいものは整数の1である。
A preferable alkyl group for R 1 is a methyl group.
A preferred carbamate protecting group is a tert-butoxycarbonyl group (Boc).
An integer of 2 is preferable as nb.
A preferable value for m is the integer 1.
本発明の第3の発明は、以下のチオアミド誘導体である。
「式中、R1は、アルキル基を;R4aは、環状イミドまたはハロゲン化フェニル基を、ncは、1〜6の整数を、それぞれ意味する。」 “In the formula, R 1 represents an alkyl group; R 4a represents a cyclic imide or a halogenated phenyl group, and nc represents an integer of 1 to 6”.
R1のアルキル基として好ましいものは、メチル基である。
環状イミドとして好ましいものは、スクシンイミドである。
ncとして好ましいものは整数の1である。
A preferable alkyl group for R 1 is a methyl group.
A preferable cyclic imide is succinimide.
An integer of 1 is preferable as nc.
本発明のチオアミドとスルホニルアジドを基質とする緩和なクリック反応により、スルホニルアミジンが高収率で生成し、容易にアシルスルホンアミドへと変換可能である。また、クリック生成した結合の一部は、アシルスルホンアミドへの変換時に切断され、さらにアシルスルホンアミドもN−アルキル化後に切断可能である。また、生体直交性を有し、水溶液中室温で容易に反応が進行するため、生体系への応用できる。 By a mild click reaction using the thioamide and sulfonyl azide of the present invention as substrates, a sulfonylamidine is produced in a high yield and can be easily converted to an acylsulfonamide. In addition, a part of the click-generated bond is cleaved upon conversion to acylsulfonamide, and acylsulfonamide can also be cleaved after N-alkylation. Moreover, since it has bioorthogonality and the reaction proceeds easily at room temperature in an aqueous solution, it can be applied to biological systems.
本発明のチオアミド誘導体の製造方法について説明する
<製造法1>
「式中、R1は、アルキル基を;R3は、水素原子またはカルバメート系保護基を、R’は、アルキル基を、R”は、アシル基を、naは、1〜6の整数を、それぞれ意味する」 “Wherein R 1 represents an alkyl group; R 3 represents a hydrogen atom or a carbamate protecting group, R ′ represents an alkyl group, R ″ represents an acyl group, and na represents an integer of 1 to 6. , Meaning each "
一般式(2a)のジアミン誘導体に一般式(3)のジチオカルボン酸エステルを、反応させることにより一般式(1a)のチオアミド誘導体を得ることができる。この反応は、溶媒夕中で行ってもよく、用いられる溶媒は、特に限定されないが、テトラヒドロフランなどエーテル系溶媒が挙げられる。
反応温度は、使用される溶媒により適宜決めればよいが、20℃〜60℃、好ましくは室温である。
The thioamide derivative of the general formula (1a) can be obtained by reacting the diamine derivative of the general formula (2a) with the dithiocarboxylic acid ester of the general formula (3). This reaction may be performed in a solvent, and the solvent used is not particularly limited, and examples thereof include ether solvents such as tetrahydrofuran.
The reaction temperature may be appropriately determined depending on the solvent used, but is 20 ° C. to 60 ° C., preferably room temperature.
別法として、一般式(2a)のジアミン誘導体の一方のアミノ基をカルバメート系保護基以外の保護基、例えば、アセチル基などで保護して一般式(2aa)とした後、ローソン試薬などチオ化剤を反応させ、一般式(1a)のチオアミド誘導体を得ることもできる。 Alternatively, one amino group of the diamine derivative represented by the general formula (2a) is protected with a protecting group other than a carbamate protecting group, for example, an acetyl group to obtain the general formula (2aa), followed by thiolation such as Lawesson's reagent. A thioamide derivative of the general formula (1a) can also be obtained by reacting the agent.
一般式(1a)のR3が水素原子であるチオアミド誘導体は、トリフルオロ酢酸など有機酸や無機酸との塩とすることもできる。 The thioamide derivative in which R 3 in the general formula (1a) is a hydrogen atom can be a salt with an organic acid or an inorganic acid such as trifluoroacetic acid.
<製造法2>
「式中、R1は、アルキル基を;R3は、水素原子またはカルバメート系保護基を、R’は、アルキル基を、R”は、アシル基を、nbは、1〜6の整数を、mは、1〜2の整数を、それぞれ意味する」 “Wherein R 1 represents an alkyl group; R 3 represents a hydrogen atom or a carbamate protecting group, R ′ represents an alkyl group, R ″ represents an acyl group, and nb represents an integer of 1 to 6. , M means an integer of 1 to 2, respectively.
一般式(2b)のジアミン誘導体に一般式(3)のジチオカルボン酸エステルを、反応させることにより一般式(1b)のチオアミド誘導体を得ることができる。この反応は、溶媒夕中で行ってもよく、用いられる溶媒は、特に限定されないが、テトラヒドロフランなどエーテル系溶媒が挙げられる。
反応温度は、使用される溶媒により適宜決めればよいが、20℃〜60℃、好ましくは室温である。
The thioamide derivative of the general formula (1b) can be obtained by reacting the diamine derivative of the general formula (2b) with the dithiocarboxylic acid ester of the general formula (3). This reaction may be performed in a solvent, and the solvent used is not particularly limited, and examples thereof include ether solvents such as tetrahydrofuran.
The reaction temperature may be appropriately determined depending on the solvent used, but is 20 ° C. to 60 ° C., preferably room temperature.
別法として、一般式(2b)のジアミン誘導体の一方のアミノ基をカルバメート系保護基以外の保護基、例えば、アセチル基などで保護して一般式(2bb)とした後、ローソン試薬などチオ化剤を反応させ、一般式(1a)のチオアミド誘導体を得ることもできる。 Alternatively, one amino group of the diamine derivative of the general formula (2b) is protected with a protecting group other than a carbamate protecting group, for example, an acetyl group to obtain the general formula (2bb), followed by thiolation with Lawesson's reagent, etc. A thioamide derivative of the general formula (1a) can also be obtained by reacting the agent.
一般式(1b)のR3が水素原子であるチオアミド誘導体は、トリフルオロ酢酸など有機酸や無機酸との塩とすることもできる。 The thioamide derivative in which R 3 in the general formula (1b) is a hydrogen atom can be a salt with an organic acid or an inorganic acid such as trifluoroacetic acid.
<製造法3>
「式中、R1は、アルキル基を;R’’は、アルキル基を、R’ ’ ’は、アシル基を、R4aは、環状イミノ基を、ncは、1〜6の整数を、それぞれ意味する」 “Wherein R 1 represents an alkyl group; R ″ represents an alkyl group, R ′ ′ ′ represents an acyl group, R 4a represents a cyclic imino group, nc represents an integer of 1 to 6, I mean each "
一般式(2c)の化合物に一般式(3)のジチオカルボン酸エステルを、反応させることにより一般式(1c)のチオアミドカルボン酸エステル体を得ることができる。この反応は、溶媒夕中で行ってもよく、用いられる溶媒は、特に限定されないが、テトラヒドロフランなどエーテル系溶媒が挙げられる。
反応温度は、使用される溶媒により適宜決めればよいが、20℃〜60℃、好ましくは室温である。
A thioamide carboxylic acid ester of the general formula (1c) can be obtained by reacting the compound of the general formula (2c) with the dithiocarboxylic acid ester of the general formula (3). This reaction may be performed in a solvent, and the solvent used is not particularly limited, and examples thereof include ether solvents such as tetrahydrofuran.
The reaction temperature may be appropriately determined depending on the solvent used, but is 20 ° C. to 60 ° C., preferably room temperature.
別法として、一般式(2c)の化合物のアミノ基を、例えば、アセチル基などで保護して一般式(2cc)とした後、ローソン試薬などチオ化剤を反応させ、一般式(1c)のチオアミドカルボン酸エステル体を得ることもできる。 Alternatively, the amino group of the compound of the general formula (2c) is protected with, for example, an acetyl group to obtain the general formula (2 cc), and then reacted with a thiol agent such as Lawesson's reagent to give a general formula (1c) A thioamide carboxylic acid ester can also be obtained.
一般式(1c)のチオアミドカルボン酸エステル体の加水分解反応など脱保護反応に付すことにより、一般式(1ca)のチオアミドカルボン酸体を得ることができる。 A thioamide carboxylic acid form of the general formula (1ca) can be obtained by subjecting to a deprotection reaction such as a hydrolysis reaction of the thioamide carboxylic acid ester form of the general formula (1c).
一般式(1ca)のチオアミドカルボン酸体に、N-ヒドロキシスクシンイミド、ペンタフルオロフェノールなどの活性化試薬を反応させることにより、一般式(1cb)のチオアミドカルボン酸の活性化体を得ることができる。
以下、本発明を実施例で説明するが、本発明はこれらに限定されるものではない。
An activated form of the thioamide carboxylic acid of the general formula (1cb) can be obtained by reacting the thioamide carboxylic acid form of the general formula (1ca) with an activating reagent such as N-hydroxysuccinimide and pentafluorophenol.
EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to these.
実施例1
(1)N-Boc-エチレンジアミン(79μL,0.5mmol)をテトラヒドロフラン0.5mLに溶解し、その溶液にジチオ酢酸エチル(69 μL, 0.6mmol)を滴下して加えた。30分間室温で撹拌した後、分取薄層クロマトグラフィー(PLC)(クロロホルム:メタノール=10:1)にて精製し、無色固体のtert-butyl 2-ethanethioamidoethylcarbamate(化合物1)を108mg得た。 (1) N-Boc-ethylenediamine (79 μL, 0.5 mmol) was dissolved in 0.5 mL of tetrahydrofuran, and ethyl dithioacetate (69 μL, 0.6 mmol) was added dropwise to the solution. After stirring at room temperature for 30 minutes, purification by preparative thin layer chromatography (PLC) (chloroform: methanol = 10: 1) yielded 108 mg of colorless solid tert-butyl 2-ethanethioamidoethylcarbamate (Compound 1).
1H NMR(400MHz,CDCl3,TMS)δ8.71(brs,1H), 4.98(brs,1H), 3.67(d,J=5.6Hz,2H), 3.43(dd,J=5.6,11.2Hz,2H), 2.55(s,3H), 1.45(s,9H).
HRMS (ESI): calcd for MNa+, C9H18N2O2SNa : 241.0987 ; found 241.0985.
1 H NMR (400MHz, CDCl 3 , TMS) δ8.71 (brs, 1H), 4.98 (brs, 1H), 3.67 (d, J = 5.6Hz, 2H), 3.43 (dd, J = 5.6,11.2Hz, 2H), 2.55 (s, 3H), 1.45 (s, 9H).
HRMS (ESI): calcd for MNa + , C 9 H 18 N 2 O 2 SNa: 241.0987; found 241.0985.
(2)tert-butyl 2-ethanethioamidoethylcarbamate (45mg, 0.206mmol)を50%トリフルオロ酢酸/塩化メチレンに溶解し、15分間室温で撹拌した。溶媒を減圧留去し真空乾燥することで、無色油状のN-(2-aminoethyl)ethanethioamide (化合物2 )の2TFA塩を69mg得た。 (2) tert-butyl 2-ethanethioamidoethylcarbamate (45 mg, 0.206 mmol) was dissolved in 50% trifluoroacetic acid / methylene chloride and stirred at room temperature for 15 minutes. The solvent was distilled off under reduced pressure and vacuum dried to obtain 69 mg of 2TFA salt of colorless oily N- (2-aminoethyl) ethanethioamide (Compound 2).
1H NMR (400MHz,CD3OD)δ 3.91(t,J=7.0Hz,2H), 3.21(t,J=7.0Hz,2H), 2.50 (s,3H).
HRMS (ESI): calcd for MH+, C4H11N2S : 119.0643 ; found 119.0637.
1 H NMR (400 MHz, CD 3 OD) δ 3.91 (t, J = 7.0 Hz, 2H), 3.21 (t, J = 7.0 Hz, 2H), 2.50 (s, 3H).
HRMS (ESI): calcd for MH + , C 4 H 11 N 2 S: 119.0643; found 119.0637.
実施例2
(1)グリシンエチルエステル・塩酸塩(140mg, 1mmol)とトリエチルアミン(664μL, 5mmol)をテトラヒドロフラン15mLに加えた後に、ジチオ酢酸エチル(126μL, 1.1mmol)を滴下しながら加え、室温で終夜撹拌した。溶媒を減圧留去し、真空乾燥した後、シリカゲルカラムクロマトグラフィー(クロロホルム)にて精製し、淡黄色油状の2-エタンチオイミド酢酸エチルエステル(化合物3)を160mg得た。 (1) Glycine ethyl ester / hydrochloride (140 mg, 1 mmol) and triethylamine (664 μL, 5 mmol) were added to 15 mL of tetrahydrofuran, and then ethyl dithioacetate (126 μL, 1.1 mmol) was added dropwise, followed by stirring at room temperature overnight. The solvent was distilled off under reduced pressure, vacuum-dried, and then purified by silica gel column chromatography (chloroform) to obtain 160 mg of 2-ethanethioimidoacetic acid ethyl ester (Compound 3) as a pale yellow oil.
1H NMR (400 MHz,CDCl3)δ 7.75(brs, 1H), 4.37(d,J=4.4Hz,2H), 4.27(q,J=7.2Hz,2H), 2.61 (s,3H), 1.31(t,J=7.2Hz,3H).
HRMS (ESI): calcd for MNa+, C6H11NO2SNa : 184.0408 ; found 184.0403.
1 H NMR (400 MHz, CDCl 3 ) δ 7.75 (brs, 1H), 4.37 (d, J = 4.4Hz, 2H), 4.27 (q, J = 7.2Hz, 2H), 2.61 (s, 3H), 1.31 (t, J = 7.2Hz, 3H).
HRMS (ESI): calcd for MNa + , C 6 H 11 NO 2 SNa: 184.0408; found 184.0403.
(2)2-エタンチオイミド酢酸エチルエステル(48mg, 0.3mmol)エタノール1mL に溶解し、1N水酸化ナトリウム水溶液を加え、室温で30分撹拌した。1N塩酸水溶液にて中和後、陽イオン交換樹脂(Dowex 50w x 8)を加えて、室温で10分間静かに撹拌した。樹脂を濾別し、濾液の溶媒を減圧留去後、真空乾燥することで淡黄色固体の2-エタンチオアミド酢酸(化合物4)を33mg(85%)得た。 (2) 2-Ethanthioimidoacetic acid ethyl ester (48 mg, 0.3 mmol) was dissolved in 1 mL of ethanol, 1N aqueous sodium hydroxide solution was added, and the mixture was stirred at room temperature for 30 minutes. After neutralization with 1N aqueous hydrochloric acid, a cation exchange resin (Dowex 50w × 8) was added, and the mixture was gently stirred at room temperature for 10 minutes. The resin was filtered off, and the solvent of the filtrate was distilled off under reduced pressure, followed by vacuum drying to obtain 33 mg (85%) of 2-ethanethioamidoacetic acid (compound 4) as a pale yellow solid.
1H NMR (400 MHz,CD3OD)δ 4.34(s, 2H), 2.51 (s,3H).
HRMS (ESI): calcd for [M-H+]-, C4H6NO2S : 132.0119 ; found 132.0122.
1 H NMR (400 MHz, CD 3 OD) δ 4.34 (s, 2H), 2.51 (s, 3H).
HRMS (ESI): calcd for [MH + ] - , C 4 H 6 NO 2 S: 132.0119; found 132.0122.
(3)2-エタンチオアミド酢酸(33mg, 0.25mmol)とN-ヒドロキシコハク酸イミド(NHS:35mg, 0.3mmol)を 脱水アセトニトリル5 mLに溶解し、その溶液に1-エチル-3-(3-ジメチルアミノプロピル)カルボジイミド塩酸塩(WSC:71mg, 0.37mmol)を加えて、1時間室温で撹拌した。溶媒を減圧留去後、残渣に水を加え、クロロホルムで10 回抽出した。有機層を合わせて硫酸マグネシウムで乾燥し、溶媒を減圧留去・真空乾燥して、無色固体の2-エタンチオアミド酢酸コハク酸アミドエステル(化合物5 )27mg(47%)得た。 (3) 2-Ethanethioamidoacetic acid (33 mg, 0.25 mmol) and N-hydroxysuccinimide (NHS: 35 mg, 0.3 mmol) are dissolved in 5 mL of dehydrated acetonitrile, and 1-ethyl-3- (3- Dimethylaminopropyl) carbodiimide hydrochloride (WSC: 71 mg, 0.37 mmol) was added and stirred for 1 hour at room temperature. The solvent was distilled off under reduced pressure, water was added to the residue, and the mixture was extracted 10 times with chloroform. The organic layers were combined and dried over magnesium sulfate, and the solvent was distilled off under reduced pressure and dried under vacuum to obtain 27 mg (47%) of 2-ethanethioamide acetic acid amide ester (compound 5) as a colorless solid.
1H NMR(400MHz, CD3OD)δ 4.34 (s, 2H), 2.82(s, 4H), 2.51 (s, 3H). 1 H NMR (400 MHz, CD 3 OD) δ 4.34 (s, 2H), 2.82 (s, 4H), 2.51 (s, 3H).
実施例3
(1)N-Boc-ジエチレングリコールビス(3-アミノプロピル)エーテル(160mg, 0.5mmol)をテトラヒドロフラン1mLに溶解し、その溶液にジチオ酢酸エチル(69μL, 0.6mmol)を滴下して加えた。30分間室温で撹拌した後、分取薄層クロマトグラフィー(PLC)(クロロホルム:メタノール=10:1)にて精製し、淡黄色油状のtert-butyl 2-(2-ethanethioamidoethoxy)ethyl carbamate (化合物6) を188mg得た。 (1) N-Boc-diethylene glycol bis (3-aminopropyl) ether (160 mg, 0.5 mmol) was dissolved in 1 mL of tetrahydrofuran, and ethyl dithioacetate (69 μL, 0.6 mmol) was added dropwise to the solution. After stirring for 30 minutes at room temperature, the product was purified by preparative thin layer chromatography (PLC) (chloroform: methanol = 10: 1) to give a pale yellow oily tert-butyl 2- (2-ethanethioamidoethoxy) ethyl carbamate (compound 6 ) Mg was obtained.
1H NMR (400MHz, CDCl3, TMS)δ 8.61(brs,1H), 4.89(brs,1H), 3.51-3.78(m,14H), 3.18-3.25 (m,2H), 2.53(s,3H), 1.91-1.94(m,2H), 1.71-1.76(m,2H), 1.44(s,9H).
HRMS (ESI): calcd for MNa+, C17H34N2O5SNa : 401.2086 ; found 401.2084.
1 H NMR (400MHz, CDCl 3 , TMS) δ 8.61 (brs, 1H), 4.89 (brs, 1H), 3.51-3.78 (m, 14H), 3.18-3.25 (m, 2H), 2.53 (s, 3H) , 1.91-1.94 (m, 2H), 1.71-1.76 (m, 2H), 1.44 (s, 9H).
HRMS (ESI): calcd for MNa + , C 17 H 34 N 2 O 5 SNa: 401.2086; found 401.2084.
(2)化合物6 (206mg, 0.55mmol)を 50%トロフルオロ酢酸/塩化メチレンに溶解し、15分間室温で撹拌した。溶媒を減圧留去し真空乾燥することで、淡黄色油状のN-(2-(2-アミノエトキシ)エチル)エタンチオアミド (化合物7)の二トリフルオロ酢酸塩を276mg得た。 (2) Compound 6 (206 mg, 0.55 mmol) was dissolved in 50% trifluoroacetic acid / methylene chloride and stirred at room temperature for 15 minutes. The solvent was distilled off under reduced pressure and vacuum-dried to obtain 276 mg of ditrifluoroacetate salt of N- (2- (2-aminoethoxy) ethyl) ethanethioamide (Compound 7) as a pale yellow oil.
1H NMR (400MHz, CD3OD)δ 3.59-3.67 (m,12H), 3.54 (t,J=6.8Hz,2H), 3.08(t,J=6.8Hz,2H), 2.45(s,3H), 1.87-1.94(m,4H).
HRMS (ESI): calcd for MH+, C12H27N2O3S : 279.1742; found 279.1739.
1 H NMR (400MHz, CD 3 OD) δ 3.59-3.67 (m, 12H), 3.54 (t, J = 6.8Hz, 2H), 3.08 (t, J = 6.8Hz, 2H), 2.45 (s, 3H) , 1.87-1.94 (m, 4H).
HRMS (ESI): calcd for MH + , C 12 H 27 N 2 O 3 S: 279.1742; found 279.1739.
本発明のチオアミドとスルホニルアジドを基質とする緩和なクリック反応で、スルホニルアミジンが高収率で生成し、容易にアシルスルホンアミドへと変換可能である。また、クリック生成した結合の一部は、アシルスルホンアミドへの変換時に切断され、さらにアシルスルホンアミドもN−アルキル化後に切断可能である。また、生体直交性を有し、水溶液中室温で容易に反応が進行するため、生体系への応用できる。 By a mild click reaction using thioamide and sulfonyl azide of the present invention as substrates, sulfonylamidine is produced in high yield and can be easily converted to acylsulfonamide. In addition, a part of the click-generated bond is cleaved upon conversion to acylsulfonamide, and acylsulfonamide can also be cleaved after N-alkylation. Moreover, since it has bioorthogonality and the reaction proceeds easily at room temperature in an aqueous solution, it can be applied to biological systems.
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