LiClO4-catalyzed one-pot synthesis of dihydropyrimidinones:: An improved protocol for Biginelli reaction

Lithium perchlorate efficiently catalyzes the three-component condensation reaction of aldehyde, beta -keto ester and urea in refluxing acetonitrile to afford the corresponding dihydropyrimidinones in high yields under neutral conditional LiOTf is also found to be an efficient catalyst for the synthesis of dihydropyrimidinones from aldehyde, beta -keto ester and urea.