... 5-(Ethoxycarbonyl)-4-(4-methylphenyl)-6-methyl -3,4- dihydropyrimidin- 2(1H )one 5-(Ethoxycarbonyl)-4-(4-chlorophenyl)-6-methyl-3, 4dihydropyrimidin- 2(1H )one 5-(Ethoxycarbonyl)-4-(3-chlorophenyl)-6-methyl -3,4- dihydropyrimidin- 2(1H )one 5-(Ethoxycarbonyl)-4-(2-chlorophenyl)-6-methyl -3,4- dihydropyrimidin- 2(1H )one ... 4ClC6H4 Me OEt O 95 4-NO2C6H4 Me OEt S 91 4-OHC6H4 Me OEt S 92 Tng hp 3,4- Dihydropyrimidin- 2(1H)- one xỳc tỏc zeolite iu kin khụng dung mụi O EtOOC + H R COOEt R + O H 2N NH2 X Zeolite (TS-1) 50C H ... acid 2.3 iu ch 3,4- dihydropyrimidin- 2(1H)- one (DHPM) Cho vo bỡnh phn ng 0,212 g benzaldehyde (2 mmol), 0,120 g urea (2 mmol), 0,260 g ethyl acetoacetate (2 mmol) v 0,1 g xỳc tỏc montmorillonite...