反应详情

To a solution of D-isoleucine (3 g, 22.9 mmol) in dioxane (184 ml), 1N aqueous sodium hydroxide (23 ml) and then benzylsulfonyl chloride (6 g, 34.4 mmol) were added and stirred at room temperature. After 3 hours, the reaction mixture was adjusted to pH 2 with 2N aqueous hydrogen chloride and then extracted with ethyl acetate. The ethyl acetate layer was dried over anhydrous magnesium sulfate. After magnesium sulfate was filtered off, the filtrate was concentrated under reduced pressure and the residue was applied to flash column chromatography (Merck Silicagel 60; mobile phase: dichloromethane:methanol=10:1, 4:1) to give N-(benzyl-sulfonyl)-D-isoleucine (6.3 g, 22.2 mmol; yield 97%).

1. extractionextracted with ethyl acetate
2. dry with materialThe ethyl acetate layer was dried over anhydrous magnesium sulfate
3. filtrationAfter magnesium sulfate was filtered off
4. concentrationthe filtrate was concentrated under reduced pressure