反应详情

温度

60 °C

80 ml of N,N-dimethylformamide was added to 5.8 g (32 mmol) of ethyl 3-amino-4,4,4-trifluorocrotonate and 6.6 g (43 mmol) of 1,8-diazabicyclo[5.4.0]-7-undecene, and 9.6 g (29 mmol) of 4-chloro-2-ethyl-6-fluoro-7-phenoxycarbonylaminobenzofuran was gradually added thereto at room temperature. After stirring at 60° C. for 8 hours, the reaction solution was poured into a 10% hydrochloric acid aqueous solution and acidified, and then extracted with ethyl acetate. The organic layer was washed sequentially with water and a saturated sodium chloride aqueous solution and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure. Then, the obtained residue was purified by silica gel column chromatography to obtain 4.8 g (yield: 44%) of the desired product as white crystals. Melting point: 154-155° C.

1. additionwas gradually added
2. customat room temperature
3. extractionextracted with ethyl acetate
4. washThe organic layer was washed sequentially with water
5. dry with materiala saturated sodium chloride aqueous solution and then dried over anhydrous magnesium sulfate
6. distillationThe solvent was distilled off under reduced pressure
7. customThen, the obtained residue was purified by silica gel column chromatography