Microwave and ultrasound promoted synthesis of substituted new arylhydrazono pyridinones

A variety of arylhydrazonopyridinones 6a,b were prepared via heating cyanoacetamide derivative with ethyl acetoacetate in the absence of solvent under reflux conventionally or ultrasound irradiation or in a microwave oven then coupling with heteroaromatic diazonium salts. Several attempts were made to synthesize corresponding aminothienopyridinones 7a,b from 6a,b. Also, attempts to add electron poor olefins to 6a,b have failed and only arylhydrazonopyridinones recovered.