反应详情

温度

-60 °C

To a solution of diisopropylamine (3.7 ml) in tetrahydrofuran (18 ml) was added dropwise a 1.6 M solution (15 ml) of 1-butyllithium in n-hexane under a nitrogen atmosphere at an inside temperature of from −62° C. to −48° C. over 5 minutes. After stirring for 30 min under ice-cooling, a solution of N-tert-butylmethanesulfonamide(3.63 g) in tetrahydrofuran (12 ml) was added dropwise at an inside temperature of from −63° C. to −59° C. over 5 minutes. After stirring for 1 hr under ice-cooling, the mixture was cooled to an inner temperature of −60° C. again. 1-Bromo-3-(tert-butyldimethylsilyloxy)propane (3.35 ml) was added dropwise and the mixture was stirrd overnight at room temperature. The reaction mixture was partitioned between ethyl acetate and saturated brine and the organic layer was dried over magnesium sulfate and concentrated to dryness under reduced pressure. The residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=9:1) to give N-tert-butyl-4-(tert-butyl-dimethylsilyloxy)butanesulfonamide (618 mg) as a pale-yellow oil.

1. temperaturecooling
2. stirringAfter stirring for 1 hr under ice-
3. temperaturecooling
4. waitthe mixture was stirrd overnight at room temperature
5. customThe reaction mixture was partitioned between ethyl acetate and saturated brine
6. dry with materialthe organic layer was dried over magnesium sulfate
7. concentrationconcentrated to dryness under reduced pressure
8. customThe residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=9:1)