Benzodiazepine derivative and process for producing the same

A compound of the general formula (I):

• ##STR19## wherein R.sub.1 represents a hydrogen atom, cyclopropylmethyl, cyclopentyl, cyclohexyl, an alkyl group of from 1 to 6 carbon atoms, carboxyl, -COOR.sub.3 wherein R.sub.3 is alky of from 1 to 4 carbon atoms, or ##STR20## wherein each of R.sub.4 and R.sub.5 are hydrogen, alkyl of from 1 to 6 carbon atoms, alkyl substituted with alkoxy groups having from 1 to 4 carbon atoms said alkyl group having 1 to 6 carbon atoms, and wherein R.sub.4 and R.sub.5 join to form with the nitrogen a 5 to 7 membered heteroxyclic ring selected from the group consisting of pyrrolidine, piperidine, homopiperidine, morpholine, N-alkylpiperazine having 1 to 3 carbon atoms in the alkyl group, and N-(2-methoxyethyl) piperazine and wherein R is a hydrogen atom, a lower alkyl having 1 to 4 carbon atoms, an acyl group -COR.sub.6 wherein R.sub.6 is phenyl, tolyl, benzyl, phenethyl or a lower alkyl group having 1 to 4 carbon atoms, and each of the rings A and B is unsubstituted or substituted by a halogen atom, nitro, lower alkyl having 1 to 4 carbon atoms, trifluoromethyl or a lower alkoxy group having 1 to 4 carbon atoms, and the pharmaceutically acceptable acid addition salts thereof.