An efficient and clean one‐pot synthesis of 3,4‐dihydropyrimidine‐2(1H)‐ones catalyzed by tungstate sulfuric acid in solvent‐free conditions

Tungstate sulfuric acid catalyzes the three component condensation reaction of an aromatic aldehyde, urea and a β‐ketoester under solvent‐free conditions to afford the corresponding dihydropyrimidinones in high to excellent yields at room temperature.     

An efficient and facile procedure for the synthesis of 4,6‐diaryl‐2(1H)‐pyridones under solvent‐free conditions

An efficient and convenient method for the preparation of 4,6‐diaryl‐2(1H)‐pyridones by the one‐pot reaction of aromatic aldehydes, aromatic ketones and malononitrile, in the presence of sodium hydroxide under solventfree condition is reported. This method has the advantages of good yields, mild reaction conditions, easy workup, inexpensive reagents and being environmentally friendly over the existing procedures.