An efficient synthesis of new thiazolopyrimidinones under microwave irradiation

摘要

7-Chloromethyl-6-nitro-5H-thiazolo[3,2-a]pyrimidin-5-one (2) is obtained by cyclocondensation of 2-aminothiazole with ethyl 4-chloroacetoacetate. This product was shown to react with various nitronate or malonate anions under microwave irradiation to give potentially bioactive 6-nitro-5H-thiazolo[3,2-a]pyrimidin-5-ones. Extension to other anions centered on S atom allows for the generalization this synthetic procedure.