反应详情

To a solution of (−)-4-[((4S)-5,7-difluoro-3,4-dihydro-2H-chromen-4-yl)oxy]-N,N,2-trimethyl-1-[(4-methylphenyl)-sulfonyl]-1H-benzimidazole-6-carboxamide (24.2 g, 44.7 mmol, STEP 9) in tetrahydrofuran (65 mL) and 2-propanol (220 mL) was added 2M sodium hydroxide aqueous solution (220 mL, 440 mmol) at room temperature. After stirring at room temperature for 4 hours, the mixture was diluted with ethyl acetate (1.20 L) and washed with saturated ammonium chloride aqueous solution (500 mL). The organic solution was dried over magnesium sulfate and concentrated in vacuum. The residue was purified by column chromatography on amino gel (ethyl acetate:methanol gradient elution from 50:1 to 20:1) to afford the title compound as a white solid (15.2 g, 87%, >99% ee).

1. washwashed with saturated ammonium chloride aqueous solution (500 mL)
2. dry with materialThe organic solution was dried over magnesium sulfate
3. concentrationconcentrated in vacuum
4. customThe residue was purified by column chromatography on amino gel (ethyl acetate:methanol gradient elution from 50:1 to 20:1)