Js. Yadav et al., Ultrasound-accelerated synthesis of 3,4-dihydropyrimidin-2(1H)-ones with ceric ammonium nitrate, J CHEM S P1, (16), 2001, pp. 1939-1941
Ceric ammonium nitrate efficiently catalyzes the three component condensati
on of an aldehyde, beta -ketoester and urea in methanol to afford the corre
sponding dihydropyrimidinones in excellent yields under sonication. Other o
xidants such as manganese triacetate and Oxone were also found to catalyze
this transformation under similar conditions.