反应详情

30 g (147 mmol) N-[3-(trifluoromethyl)phenyl]urea, 19.3 g (147 mmol) 4-cyanobenzaldehyde and 14.7 g (147 mmol) 2,4-pentanedione are suspended in 300 ml of tetrahydrofuran, and 90 g polyphosphoric acid ethyl ester are added. The mixture is stirred at reflux for 4 hours. After cooling down to room temperature, the solvent is removed in vacuo, the remainder is dissolved in ethyl acetate and sequentially washed with saturated aqueous sodium hydrogencarbonate and sodium chloride solution. The organic phase is dried over magnesium sulfate, filtered and evaporated to dryness in vacuo. The crude product is purified by column chromatography over silica gel (eluent: cyclohexane/ethyl acetate).

1. temperatureat reflux for 4 hours
2. customthe solvent is removed in vacuo
3. dissolutionthe remainder is dissolved in ethyl acetate
4. washsequentially washed with saturated aqueous sodium hydrogencarbonate and sodium chloride solution
5. dry with materialThe organic phase is dried over magnesium sulfate
6. filtrationfiltered
7. customevaporated to dryness in vacuo
8. customThe crude product is purified by column chromatography over silica gel (eluent: cyclohexane/ethyl acetate)