Collect. Czech. Chem. Commun. 1980, 45, 3593-3615

Psychotropic derivatives of 5-phenyl-7-chloro-1,3-dihydro-1,4-benzodiazepin-2-one and contribution to the synthesis of its 5-(2-chlorophenyl) analogue

Zdeněk Vejdělek, Miroslav Rajšner, Antonín Dlabač, Miroslav Ryska, Jiří Holubek, Emil Svátek and Miroslav Protiva

Research Institute for Pharmacy and Biochemistry, 130 60 Prague 3


Alkylation of 7-chloro-5-phenyl-1,3-dihydro-1,4-benzodiazepin-2-one (I) with 2,5-dimethoxyphenacyl bromide and 3-(4-phenylpiperazino)propyl chloride afforded the N-substituted derivatives of nordazepam III and IV; compound IV revealed properties of a potential hypnotic agent. Reaction of 4-chloronitrobenzene with (2-chlorophenyl)acetonitrile in methanolic solutions of alkali hydroxides gave mixtures from which the following compounds were isolated: 5-chloro-3-(2-chlorophenyl)-2,1-benzisoxazole (VII), the O-methyloxime X, 5-chloro-2,3-bis(2-chlorophenyl)indole (XI), 2-chloro-4'-nitrobenzophenone (XVII) and 2-chloro-9-cyanoacridine N-oxide (XX). A similar reaction of 4-chloronitrobenzene with (2-fluorophenyl)acetonitrile gave compound XX as the main product; in smaller amounts 4-nitroanisole, 2-fluoro-4'-nitrobenzophenone (XVIII) and 2-chloroacridine-9-carbonitrile (XXIV) were obtained. Compound VII was reduced to the aminobenzophenone derivative V which was transformed via the phthalimidoacetyl derivative VI to the chlorodemethyldiazepam II.