反应详情

To a solution of 3-(tert-butyldimethylsilyl)oxy-1-cyclohexanol (12.5 g) and triethylamine (9.8 ml) in dichloromethane (200 ml) was added dropwise methylsulfonyl -chloride (4.6 ml) at 5° C. under nitrogen atmosphere. A reaction mixture was allowed to warm to ambient temperature and stirred or 2 hours. Insoluble material was removed by filtration and mother liquor was concentrated under reduced pressure to give residue, which was dissolved in ethyl acetate (200 ml) and washed in turn with 1N-aqueous hydrochloric acid (50 ml×2), saturated sodium hydrogen carbonate in water (50 ml×2) and saturated sodium chloride in water (50 ml×2), and dried over magnesium sulfate. Evaporation of the solvent gave a residue, which was chromatographed on silica gel (300 ml) eluting with 10% ethyl acetate in n-hexane to give 3-(tert-butyldimethylsilyl)oxy-1-(methylsulfonyloxy)-cyclohexane(cis and trans mixture, 16.0 g).

1. customInsoluble material was removed by filtration and mother liquor
2. concentrationwas concentrated under reduced pressure
3. customto give residue, which
4. washwashed in turn with 1N-aqueous hydrochloric acid (50 ml×2), saturated sodium hydrogen carbonate in water (50 ml×2) and saturated sodium chloride in water (50 ml×2)
5. dry with materialdried over magnesium sulfate
6. customEvaporation of the solvent
7. customgave a residue, which
8. customwas chromatographed on silica gel (300 ml)
9. washeluting with 10% ethyl acetate in n-hexane