12-Molybdophosphoric acid: A recyclable catalyst for the synthesis of Biginelli-type 3,4-dihydropyrimidine-2(1H)-ones

A simple and one-pot method for the synthesis of dihydropyrimidones is reported. 12-molybdophosphoric acid in refluxing acetic acid catalyzes this three-component condensation reaction to afford the corresponding pyrimidinones in good yields.