反应详情

To a mixture of 0.20 g of 2-(3-methylpyridin-4-yl)-5-(trifluoromethyl)benzoxazole and 4 ml of chloroform, 0.30 g of 65% m-chloroperbenzoic acid was added while ice-cooling. The reaction mixture was stirred at room temperature for three hours, then diluted with ethyl acetate, and washed with 5% aqueous solution of sodium hydroxide and a saturated sodium chloride solution, sequentially. The organic layer was dried over anhydrous sodium sulfate, and concentrated under reduced pressure to give 0.17 g of 3-methyl-4-[5-(trifluoromethyl)benzoxazole-2-yl]pyridine N-oxide (hereinafter, referred to as “active compound 24”).

1. additionwas added while ice-
2. temperaturecooling
3. washwashed with 5% aqueous solution of sodium hydroxide
4. dry with materialThe organic layer was dried over anhydrous sodium sulfate
5. concentrationconcentrated under reduced pressure