New Tricyclic Ring Systems of Fused 1,4-Diazepines

[摘要]：New heterocyclic systems of pyrimido[1,2-d][1,4] diazepine, [1,4] diazepino[7,1-b] quinazoline, and [1,4] diazepino[1,7-a][1,3] diazepine were obtained in specific reactions of DMAD with zwitterionic compounds.

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