| abstract |
A procedure for the preparation of benzodiazepine derivatives of the general formula **(See formula)** where R represents hydrogen, halogen, nitro or trifluoromethyl; R1 and R2 represent hydrogen or lower alkyl; and B represents hydrogen, phenyl, substituted phenyl or pyridyl, characterized by oxidizing a compound of the general formula **(See formula)** in which R, R1, R2 and B have the same meaning as in formula I above, with diethyl azodicarboxylate, quinone or an alkali metal hypohalite. (Machine-translation by Google Translate, not legally binding) |