Ionic liquid/HCl catalyzed synthesis of 4-(trifluoromethyl)-2(1H)-pyrimidinones
摘要:
4-(Trifluoromethyl)-2(1H)-pyrimidinones were synthesized from the reaction between 1,1,1-trifluoro-4-methoxy-3-buten-2-ones [CF3C(O)C(R-2)C(R-1)(OCH3) where R-1 = Ph, 4-F-C6H4, 4-Cl-C6H4, 4-Br-C6H4, 4-I-C6H4, 4-CH3-C6H4, naphth-2-yl, 4-OCH3-C6H4, thien-2-yl and R-2 = H, CH3] and urea in the presence of ionic liquid [BMIM][BF4] combined with HCl. The results demonstrate that [BMIM][BF4]/HCl catalyzed the reaction in the absence of molecular solvents. Use of ionic liquid combined with HCl allowed the reaction temperatures to be increased to 100 A degrees C and decreased the reaction times from 48-72 to 3-6 h. The products were obtained in good yields (70-97 %).