A novel and efficient method has been developed for the synthesis of a series of 3,4‐dihydroquinazoline‐2(1H)‐thione derivatives in aqueousorganicsolvent starting from 3‐(2‐aminophenyl)acrylates with isothiocyanates via a tandem intermolecular nucleophilic addition/intramolecular Michael addition reaction under mild conditions. A broad substrate scope has been demonstrated, which shows wide functional