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■ An Efficient One-Pot Synthesis of Azuleno[2,1-b]pyridazines

Dao-Lin Wang,* Jian Ma, Xiao-Ce Shi, and Jian-Ying Wu

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

Abstract

A simple and efficient procedure was developed for the synthesis of 1-aryl-3-cyano-4-oxo-10-ethoxycarbonylazuleno[2,1-b]pyridazines (3) in good yields by condensation of ethyl 1-cyanoacetyl-2-methoxyazulene-3-carboxylate (1) with aryldiazonium salt (2) in pyridine via a domino reaction. This reaction provides a new procedure for synthesis of heterocyle-fused azulenes.