EASY SYNTHESIS OF 3,4-DIHYDROPYRIMIDIN -2-(1H)-ONES USING PHOSPHATE FERTILIZERS MAP, DAP AND TSP AS EFFICIENT CATALYSTS

Abstract

A simple, efficient and green procedure has been developed for the synthesis of dihydropyrimidinones (Products of Biginelli) using phosphate fertilizers (mono-ammonium phosphate (MAP), di-ammonium phosphate (DAP) and triple super phosphate (TSP)) as catalyst. The one-step reaction involved the three compounds, which are registered aromatic aldehydes, dicarbonyl compounds and the urea/thiourea. This new method provides some advantages such as obtaining excellent yields (98%), as well as the short duration of the reaction, which may attain 2 min. These catalytic heterogeneous systems present also the advantage of being easily recycled.