SYNTHESIS OF SOME PYRAZOLE-FUSED PYRIDO[3,2-a]AZULENES

摘要

Facile synthesis of 11H(2H)-4-oxopyrazolo[3',4':6,5]pyrido-[3,2-a]azulene-10-carboxylates (3) via a domino reaction of 3-(dimethyl-amino)-2-(2-methoxy-1-ethoxycarbonylazulen-3-oyl)acrylonitrile (1) with hydrazines (2) in moderate to good yields. This reaction provides a new procedure for synthesis of pyridinone-fused azulenes.