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■ Synthesis of Some Pyrazole-Fused Pyrido[3,2-a]azulenes

Dao-Lin Wang,* Zhe Dong, Qing-Tao Cui, Fei-Fei Yang, and Wei Zhao

*Liaoning Key Laboratory of Synthesis and Application of Functional Compound, College of Chemistry & Chemical Engineering, Bohai University, Jinzhou 121001, China

Abstract

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-(dimethylamino)-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.