反应详情

(3S)-7,8-Difluoro-3-methyl-3,4-dihydro-2H-[1,4]benzoxazine·p-toluenesulfonate (1 g) was suspended in AcOEt (10 ml) and then an aqueous solution of sodium hdyrogencarbonate (NaHCO3; 10 ml) was added thereto. After stirring at room temperature for 1 hour, the mixture was extracted with AcOEt. The organic layer was dried over anhydrous magnesium sulfate and concentrated under reduced pressure to thereby give the title compound (516 mg, 99.8% ee) as a yellow oily substance.

1. extractionthe mixture was extracted with AcOEt
2. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
3. concentrationconcentrated under reduced pressure