DE1545555B2 - Process for the preparation of 1,3-dihydro-S-amino ^ H-M-benzodiazepin-2-ones - Google Patents

Description

NH,

or below with ammonia. Suitable solvents for the reaction are preferably neutral and inert solvents such as diethyl ether, dioxane, ethylene glycol dimethyl ether, ethylene glycol monomethyl ether, Methanol, ethanol or their mixtures with or without water can be considered.

The preparation of the starting compounds for the process according to the invention is in the Journal of Organic Chemistry, 27, 1691-1695 (1962).

ίο The compounds obtainable according to the invention show valuable pharmacological properties, in particular a valuable effect on the nervous system with low toxicity. They should therefore be used to treat anxiety, tension and restlessness serve and combat nervousness, irritability and mood lability. Furthermore, they should be used for psycho-vegetative conversion of unstable patients. Your beneficial properties can be seen from the following test report.

The invention relates to a process for the preparation of 1,3-dihydro-3-amino-2 H -1,4-benzodiazepin-2-ones the general formula

35

in which Ar denotes a phenyl radical or a phenyl radical substituted by a halogen atom, thereby characterized in that one has a corresponding 1,3-dihydro-3-halogen-5-aryl-2H-1,4-benzodiazepin-2-one reacts with ammonia in a manner known per se.

The 1,3-dihydro-3-amino-2H-1,4-benzodiazepin-2-ones are readily available by aminating one in one suitable solvents, such as ethylene glycol dimethyl ether, dissolved 1,3 - dihydro - 3 - halogen-2H-l, 4-benzodiazepin-2-ones can be produced with ammonia. This reaction is preferably carried out at room temperature and performed using excess ammonia. The reaction mixture is then filtered and the filtrate concentrated in vacuo, a precipitate separating out, which in cold Dissolved acetonitrile and used to precipitate the product according to the invention as the hydrochloride salt alcoholic hydrochloric acid is treated. To prepare the free base, the salt thus obtained is in Dissolved water and treated with aqueous soda solution.

The chlorine atom in the 3-position of the starting compounds is very reactive, and as a result, these react at room temperature

On the basis of the following experiments, the substance obtainable according to the invention was compared to the from Journal of Organic Chemistry, Vol. 26 (1961), pp. 4936 to 4941, known 1-methyl-5-phenyl-7 - chlorine -1,2 - dihydro - 3 H -1,4 - benzodiazepinone - (2) compared:

1. Toxicity determination LD ₅₀

_{The LD 50} toxicity determination was carried out after oral administration to rats, with male and half female animals being used.

2. Anti-pentamethylene tetrazole effect

To test the anti-pentamethylenetetrazole effects, the compounds to be examined in each case were administered orally in exactly the same amounts to groups of 6 mice each (three male and female animals). After one hour, the test animals were each given 125 mg / kg of pentamethylenetetrazole, which was given intraperitoneally, to a state of excitement. The onset of clonic and tonic convulsions and death was observed for half an hour. The protective effect against convulsions and death was determined by control tests carried out at the same time. The effective dose ED ₅₀ with regard to the prevention of convulsions and / or death was calculated from the test curves.

3. Anti-electric shock effect

Maximum electric shock attacks (MES) (cf. Swinyard, Brown, Goodman, Journ. Pharmacol. Exper. Therap., 106, 319 [1952]) were administered by gradual dosing the substances were determined in groups of 6 mice each (3 male and 3 female animals).

1 hour after the application, the test animals were passed through corneal electrodes (25 niA; 0.2 sec.) subjected to supramaximal electric shocks. The occurrence or absence of tonic extensor seizures was registered as well as the number of deaths and the percentage protective effect against the seizures calculated.

4. Anti-morphine effect

(See Holten, Acta pharmacol. Et toxicol., 13, 113 [1957]). The substances under investigation are in different doses orally on groups of 6 mice each (3 male and 3 female animals) administered. 1 hour later, the test animals are treated with morphine sulfate in concentrations of 100 mg / kg given intraperitoneally, excited. The occurrence of "Straub tail" and circular movements is registered and with control attempts compared.

5. Ataxia (muscle relaxation)

(See Dunham and Miya, J. Am. Pharm. Assoc. Scientific edn., 46, 208 [1957]). The test substances were administered orally to groups of 6 mice each (3 male and 3 female) in different doses. After the treatment, each test animal was tested on a rotating rod for 1 minute ^{at intervals of 1,} ₂ , 1 and 2 hours. The percentage ataxia is calculated from the formula '

r ₀ - r / _To loo.

in which T ₀ and T mean the average time in minutes for the control and test mice, respectively, that the test animals remain on the stick. Probit-log paper is used to calculate the effective ED _{50 dose.}

The results obtained are as follows Table outlined.

Tabel

Investigated effect

3-amino-5-phenyl ■
7-chloro-l, 3-dihydro-2H-l, 4-benzodiazepinon- (2)

1 -Methyl-5-phenyl-7-chloro-1,2-dihydro-3H-1,4-benzodiazepinone- (2)

LD ₅₀ (mg / kg); po in the rat
Anti-pentamethylene tetrazole effect (ED ₅₀ in mg / kg)

Effect against maximum electric shock (MES)
(ED ₅₀ in mg / kg)

Anti-morphine effect (ED ₅₀ in mg / kg)
Ataxia (ED ₅₀ in mg / kg)

Ataxia
Anti-pentamethylene tetrazole effect

Ataxia

Effect against MES

Ataxia
Anti-morphine effect

2300
7.8
13.0

21.0

64.0

■ 64

7.8

64
13th

64
21

= 8.21
= 4.92
= 3.05

1517
0.7
6.0

5.6

0.4
0.4

0.7

0.4
6.0

0.4
5.6

0.571
0.067
0.0715

The table above shows the ataxic effect of the substance according to the invention, which is lower by a factor of 160 and which is undesirable in tranquillantia. Accordingly, the substance according to the invention also has more favorable ratios of undesirable to desirable effects. Furthermore, the substance according to the invention has a more favorable LD ₅₀ value, determined p..o. in the rat.

The compounds according to the invention 3-Amino-5-phenyl-7-chloro-1,3-dihydro-2H-1,4-benzodiazepinone- (2) and especially the 3 - amino - 5 - chlorophenyl - 7 - chloro - 1,3 - dihydro-2H-1,4-benzodiazepinone- (2) compared to that from Journal of Organic Chemistry, Vol. 26, p. 1111 (1961), . the well-known 7-chloro-2-methylamino-5-phenyl-3H-1,4-benzodiazepine-4-oxide last but not least It has also been shown to be superior due to its lower undesirable ataxic effect.

The following example serves to further explain the invention.

example

A mixture of 5.0 g of 7-chloro-3-hydroxy-5-phenyl -1,3 - dihydro - 2 H - J, 4 - benzodiazepin - 2 - one and 50 ml of thionyl chloride is refluxed for 30 minutes and then not that reacted thionyl chloride evaporated under reduced pressure. Ether is added to the residue and 3,7-dichloro-5-phenyl-1,3-dihydro-2 H-1,4-benzodiazepin-2-one, which is used as the starting substance separated, dissolved in ethylene glycol dimethyl ether and a small amount of undissolved substance freed by filtration. The solution then becomes excess in ethylene glycol dimethyl ether added dissolved ammonia and stirred at room temperature for 20 minutes. The mixture is filtered and the filtrate is concentrated in vacuo. The residue is dissolved in cold acetonitrile dissolved and treated with excess alcoholic hydrochloric acid; whereby the hydrochloride precipitates.

5 6

The hydrochloride salt can be dissolved in water by recrystallization from alcohol

Hydrochloride of the semi-alcoholate of 3-amino and then with soda solution for the purpose of precipitation

7 - chloro - 5 - phenyl - 1,3 - dihydro - 2H - 1,4 - benzo-free base, which after recrystallization

diazepin-2-one with a melting point of 225 to 226 ° C. sieren from alcohol a melting point of 205 to

5 206 ⁰ C has.

AHaIySeTUrC ₁₅ H ₁₂ ClN ₃ O-HCl-V ₂ C ₂ H ₅ OH: .... _

Analysis for C ₁₅ H ₁₂ ClN ₃ O:

Calculated ... C 55.66, H 4.07, N 12.12, Cl 20.54; Calculated ... C 63.05, H 4.23, N 14.71, Cl 12.41;

found .... C 55.62, H 4.57, N 12.36, Cl 20.51. found .... C 63.20, H 4.36, N 14.86, CI 12.20.

Claims (1)

Claim: Process for the preparation of 1,3-dihydro-3-amino-2H-1,4-benzodiazepin-2-ones the general formula O "' N-C H / ^C \
C = N NH ₂ Ar in which Ar is a phenyl radical or a phenyl radical substituted by a halogen atom, characterized in that a corresponding 1,3-dihydro-3-halogen-5-ary 1-2H-1,4-benzodiazepin-2-one reacts with ammonia in a manner known per se.