Improvement in the production of psychotropic 1-substituted-1,3-dihydro-1,4-benzodiazepin-2-ones starting from 2-(1-substituted)amino-benzophenonimines through novel intermediates of the formula: <IMAGE> (wherein R is hydrogen, methyl or benzyl, R1 is C1-C5 alkyl or phenyl-C1-C5 alkyl, X and Y each is hydrogen or halogen and n is an integer of 1 to 2) with economical and industrial advantage.
Process for preparing 1-substituted-1,4-benzodiazepine derivatives