method for the one‐pot synthesis of the biologically important heterocyclicmolecules 5‐unsubstituted 3,4‐dihydropyrimidin‐2‐ones and thiones using gem‐dibromomethylarenes, oxalacetic acid, and urea or thiourea. Gem‐dibromomethylarenes are used as aldehyde equivalent for the efficient synthesis of 3,4‐dihydropyrimidin‐2‐ones/thiones. This reaction offers advantages for the synthesis of these compounds
A New Substrate for the Biginelli Cyclocondensation: Direct Preparation of 5-Unsubstituted 3,4-Dihydropyrimidin-2(1<i>H</i>)-ones from a β-Keto Carboxylic Acid