Js. Yadav et al., Microwave-assisted efficient synthesis of dihydro pyrimidines: improved high yielding protocol for the Biginelli reaction, J CHEM R-S, (7), 2000, pp. 354-355
Dihydropyrimidines were synthesised in high yields by one-pot cyclocondensa
tion reaction of aldehydes, acetoacetates and urea using various acid catal
ysts like Amberlyst-15, Nafion-H, KSF clay and dry acetic acid under microw
ave irradiation.