Benzazetes as precursors for benzotriazepines
Abstract
The primary cycloadducts from 2-phenylbenzazete (1) and diarylnitrile imines (2) rearrange spontaneously to 1,2,4-triarylbenzo[f]-1,3,5-triazepines (5); the isolable but labile adduct from the azete (1) and diazomethane is transformed into the azidostyrene (8) thermally, and into a mixture of 2- and 3-phenylindoles and the ketone (11) in the presence of acidic catalysts.