Polyaza-azulenes. Part 1. Synthesis and reactions of some 2,3,3a,6-tetrahydropyrazolo[3,4-d][1,2]diazepines

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Abstract
The reactions of 2,3,3a,6-tetrahydropyrazolo[3,4-d][1,2]diazepines (2) with methanolic sodium carbonate have been investigated. 4-Vinylpyrazoles (3) and (4), 2,4,5,6-tetrahydropyrazolo[3,4-d][1,2]diazepines (5), 1(2),4,5,6-tetrahydropyrazolo[3,4-d][1,2]diazepines (6), and 1(2),6-dihydropyrazolo[3,4-d][1,2]diazepines (7) are obtained, the nature of the product being dependent upon the way in which (2) is substituted. The mechanism by which the above compounds are formed is discussed.

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