Quinazolines and 1,4-benzodiazepines. 81. s-Triazolo[4,3-a][1,4]benzodiazepines by oxidative cyclization of hydrazones

s-Triazolo[4,3-a][1,4]benzodiazepines bearing various substituents in the 1 position were prepared by oxidative cyclization of the appropriate aldehyde hydrazones of 2-hydrazinobenzodiazepines. Diethyl azodicarboxylate and activated manganese dioxide were used as oxidizing agents. The new triazolo compounds were active in the CNS tests but none of them reached the potency of the known triazolobenzodiazepines.