反应详情

In N,N-dimethylformamide (13 mL) was dissolved 5-bromo-3-chloro-2-[5-(trifluoromethyl)-1H-imidazol-2-yl]pyridine (1.27 g), 60% sodium hydride (187 mg) was added to the solution under ice-cooling, and after raising the mixture to room temperature, the mixture was stirred for 1 hour. The reaction mixture was ice-cooled, 2-(trimethylsilyl)ethoxymethyl chloride (1.03 mL) was added to the mixture, and after raising the mixture to room temperature, the mixture was stirred for 1 hour. Water was added to the reaction mixture, the mixture was extracted with ethyl acetate, and the organic layer was washed with water and a saturated brine, and dried over anhydrous magnesium sulfate. After concentrating the mixture under reduced pressure, the obtained residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=100:0 to 95:5) to obtain 5-bromo-3-chloro-2-[4-(trifluoromethyl)-1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-imidazol-2-yl]pyridine (1.56 g).

1. additionwas added to the solution under ice-
2. temperaturecooling
3. temperaturecooled
4. temperatureafter raising the mixture to room temperature
5. stirringthe mixture was stirred for 1 hour
6. extractionthe mixture was extracted with ethyl acetate
7. washthe organic layer was washed with water
8. dry with materiala saturated brine, and dried over anhydrous magnesium sulfate
9. concentrationAfter concentrating the mixture under reduced pressure
10. customthe obtained residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=100:0 to 95:5)