反应详情

4-(4-Bromo-2-fluoro-phenyl)-2-methanesulfonyl-2-methyl-butyric acid (1.96 g, 5.55 mmol), O-tetrahydro-2H-pyran-2-yl-hydroxylamine (0.910 g, 7.77 mmol), 1-hydroxy benzotriazole monohydrate (1.53 g, 9.99 mmol), triethylamine (1.39 mL, 9.99 mmol) and 1, (3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (1.49 g, 7.77 mmol) were combined followed by the addition 60 mL of dichloromethane. The reaction was allowed to stir at room temperature overnight, was then diluted with 20 mL of dichloromethane and 60 mL of water. The aqueous layer was re-extracted with DCM (2×40 mL). The organics were combined, dried over magnesium sulfate, filtered and concentrated onto silica gel. Silica chromatography (40% ethyl acetate 60% heptane to 40% ethyl acetate 60% heptane to 80% ethyl acetate 20% heptane for 60 minutes) afforded the title compound as a white foam 2.0 g, (79.9%). LC-MS m/z 452.1 (M−1)

1. extractionThe aqueous layer was re-extracted with DCM (2×40 mL)
2. dry with materialdried over magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated onto silica gel