Microwave-Assisted Efficient synthesis of Dihydro Pyrimidines: Improved High Yielding Protocol for the Biginelli Reaction

Dihydropyrimidines were synthesised in high yields by one-pot cyclocondensation reaction of aldehydes, aceto-acetates and urea using various acid catalysts like Amberlyst-15, Nafion-H, KSF clay and dry acetic acid under microwave irradiation.