Synthesis of 3,4-Dihydropyrimidine-2-(1H)- Ones/Thiones Catalyzed by Ionic Liquid [C₂O₂BBTA][TFA]

Abstract

Carboxyl functional ionic liquid with benzotriazole cation and trifluoroacetate anion can be used as environmental-friendly catalyst for the efficient synthesis of 3,4-dihydropyrimidin-2(1H) ones /thiones under solvent-free conditions. Moreover, the ionic liquid [C2O2BBTA][TFA] can be easily recycled and reused for at least four cycles without obvious loss of catalytic activity.