An efficient synthesis of 3,4-dihydropyrimidin-2-ones catalyzed by NH2SO3H under ultrasound irradiation.
The condensation of aldehydes, beta-keto esters and urea catalyzed by NH(2)SO(3)H in ethanol results dihydropyrimidinones in high yields under ultrasound irradiation.
Li
Ji-Tai
JT
College of Chemistry and Environmental Science, Hebei University, Baoding 071002, PR China. orgsyn@mail.hbu.edu.cn
Han
Jun-Fen
JF
Yang
Jin-Hui
JH
Li
Tong-Shuang
TS