Chemistry of the 5:7-fused heteroaromatic systems: a novel rearrangement involving the imidazo[4,5-e][1,3,4]triazepine and pyrazolo[3,4-e][1,3,4]-triazepine systems

Treatment of the heterocyclic hydrazidines (I) and (IV) with TFA gives the primary amines (II) and (V), together with the methyltriazolyl-substituted imidazole (III) or pyrazole (VI).