Sodium Bicarbonate → (3S)-3-Methyl-7,8-difluoro-2,3-dihydro-4H-1,4-benzoxazine

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Reaction Steps

(3S)-7,8-Difluoro-3-methyl-3,4-dihydro-2H-[1,4]benzo xazine•p-toluenesulfonate (1 g) was suspended in AcOEt (10 ml) and then an aqueous solution of 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 (645.2 mg, 99.9% ee) as a yellow oily substance. Various spectral data was identical with those obtained in Example 83.

Provenance & Evidence