Abstract
Michael addition of chalcone with active methylene compound such as diethyl malonate, nitromethane and ethyl acetoacetate catalyzed by potassium hydroxide in anhydrous ethanol results Michael adducts in 75–98% yield under ultrasound irradiation in 25–90 min.
Acknowledgment
The project was supported by NSFC (29872011), Natural Science Foundation of Hebei Province (299080), P.R. China.