In connection with our previous work on the synthesis
of 3,4-dihydropyrimidin-2-(1H)-ones using convenient
and inexpensive acid as a catalyst,21 we wish to report
a simple but effective procedure for Biginelli’s threecomponent
condensation producing high yields of 3,
4-dihydropyrimidin- 2(1H)-ones by employing chloroacetic
acid as a sort of efficient catalyst (Scheme 1).