反应详情

4-(4-Bromo-2-methylphenyl)-2-methyl-2-(methylsulfonyl)butanoic acid (3.28 g, 9.39 mmol), O-tetrahydro-2H-pyran-2-yl-hydroxylamine (2.19 g, 18.7 mmol), 1-hydroxy benzotriazole monohydrate (3.68 g, 24 mmol), triethylamine (3.35 mL, 24 mmol) and (3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (3.59 g, 18.7 mmol) were combined followed by the addition 60 mL of dichloromethane. The reaction was allowed to stir at room temperature overnight. The reaction mixture was diluted with 20 mL of dichloromethane and 60 mL of water. The aqueous layer was extracted with dichloromethane (2×40 mL). The organics were combined, dried over magnesium sulfate, filtered and concentrated onto silica gel. Silica chromatography (30% ethyl acetate 70% heptane for 10 minutes, then 30% ethyl acetate 70% heptane to 60% ethyl acetate 40% heptane for 40 minutes) afforded the title compound as a white solid (2.11 g, 50.1%).

1. extractionThe aqueous layer was extracted with dichloromethane (2×40 mL)
2. dry with materialdried over magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated onto silica gel
5. waitSilica chromatography (30% ethyl acetate 70% heptane for 10 minutes