EFFICIENT AND GREEN MICROWAVE-ASSISTED MULTICOMPONENT BIGINELLI REACTION FOR THE SYNTHESIS OF DIHYDROPYRIMIDINONES CATALYZED BY HETEROPOLYANION-BASED IONIC LIQUIDS UNDER SOLVENT-FREE CONDITIONS

An efficient and green route for the synthesis of dihydropyrimidinones via microwave-assisted Biginelli reaction catalyzed by 3 mol% of heteropolyanion-based ionic liquids under solvent-free conditions has been reported. The practical reaction was found to be compatible with different structurally diverse substrates. Good to excellent yields, short reaction times, and operational simplicity are the main highlights of this protocol. Moreover, the heteropolyanion-based ionic liquids were easily reusable for this Biginelli reaction.