反应详情

Add acetic anhydride (0.084 ml, 0.89 mmol) to a solution of (2R,3S,5R)-5-[(1R,2S)-2-amino-3-(3,5-difluorophenyl)-1-hydroxypropyl]-2-(2,2-dimethylpropoxy)-3-methylmorpholine-4-carboxylic acid tert-butyl ester (400 mg, 0.85 mmol) in dry dichloromethane (9 mL). Add triethylamine (0.179 mL, 1.27 mmol), stir 1 hour at room temperature, concentrate and purify (silica gel cartridge chromatography, eluting with 1:1 hexanes:ethyl acetate) to give the title compound as a white solid (397 mg, 91%).

1. concentrationconcentrate
2. custompurify
3. wash(silica gel cartridge chromatography, eluting with 1:1 hexanes:ethyl acetate)