3H-1,3,4-Benzotriazepines from (N-arylbenzimidoyl)-5-dimethylaminotetrazoles: 1,7-vs. 1,5-cyclisation of extended dipolar nitrile imines

Abstract
Thermolysis of both 1- and 2-N-arylbenzimidoyl-5-dimethylaminotetrazoles [(7) or (8)] generates nitrile imines (9), which cyclise to yield either 1,2,4-triazoles (10) or 3H-1,3,4-benzotriazepines (12), depending on the nature of the N-aryl group and on conditions.

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