[Synthesis and biological activity of 5-phenyl-1,3,4-benzotriazepines. 25. Synthesis of (1,2,4)triazolo(4,3-a)(1,3,4)benzotriazepines and related tricyclics].

Some title compounds can be obtained conveniently by dehydration of 2-acylhydrazino- or by dehydrogenation of 2-(2-methylenhydrazino)- or by elimination of aniline from 2-phenyl(thio)semicarbazido-1,3,4-benzotriazepines. The direct cyclization of 2-hydrazino-1,3,4-benzotriazepines is not so suitable. The direction of the anellation can be elucidated by comparison of the UV spectra from compounds of known structure.