反应详情

A mixture of 46 mg of 60% sodium hydride (in oil) and 2 ml of DMF was stirred at room temperature, to which a mixture solution of 0.12 g of 2,2,2-trifluoroethanol and 0.5 ml of DMF was added. After 15 minutes, 0.28 g of 6-chloro-2-(3-fluoropyridin-4-yl)-5-(trifluoromethyl)benzoxazole was added and stirred at room temperature for one hour. Water was added to the reaction mixture, followed by extraction with ethyl acetate twice. The combined organic layers were washed with a saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to give 0.26 g of 6-chloro-2-[3-(2,2,2-trifluoroethoxy)pyridin-4-yl]-5-(trifluoromethyl)benzoxazole (hereinafter, referred to as “active compound 92”).

1. additionwas added
2. extractionfollowed by extraction with ethyl acetate twice
3. washThe combined organic layers were washed with a saturated sodium chloride solution
4. dry with materialdried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure