反应详情

温度

-78 °C

2-bromo-4-methylpyridine (4.7 g) was dissolved in diethylether (150 ml), and the mixture was cooled to −78° C. under argon atmosphere. 1.6M n-butyllithium hexane solution (16.8 ml) was added dropwise to the solution, and the mixture was stirred for 30 minutes. The reaction solution was added dropwise to a solution of 4-fluoro-N-methoxy-N-methyl-2-trifluoromethylbenzamide (6.2 g) in diethylether (50 ml) under argon atmosphere at −78° C. The mixture was allowed to be at room temperature and stirred overnight, and water was added to the mixture. The mixture was concentrated and extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over anhydrous magnesium sulfate, and then, the solvent was distilled off. The residue was purified by silica gel column chromatography (elution solvent: ethyl acetate/hexane), to give 2-(4-fluoro-2-trifluoromethylbenzoyl)-4-methylpyridine (4.5 g) as pale yellow amorphous.

1. customto be at room temperature
2. stirringstirred overnight
3. concentrationThe mixture was concentrated
4. extractionextracted with ethyl acetate
5. washThe organic layer was washed with water and saturated brine
6. dry with materialdried over anhydrous magnesium sulfate
7. distillationthe solvent was distilled off
8. customThe residue was purified by silica gel column chromatography (elution solvent: ethyl acetate/hexane)