Synthesis of novel pyrazolo[3,4-d]pyrimidines peri-fused with 1,4-diazepine, 1,4-thiazepine, and 1,2,4-triazepine rings

[摘要]：A simple and efficient synthesis of novel ortho- and peri-annulated heterocyclic systems2,6,7,9-tetrahydro-8H-pyrazolo[5,4,3-de]pyrimido[4,5-e][1,4]diazepine, 2,6,7,9-tetrahydro-8H-pyrazolo[5,4,3-de]pyrimido [5,4-f][1,4]thiazepine, and 6,9-dihydro-2H-pyrazolo[3,4,5-ef]pyrimido[5,4-f][1,2,4]triazepine is described. J. Heterocyclic Chem.,, (2012).

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