反应详情

温度

0 °C

To a mixture of 5.0 g (32.14 mmol) of D,L-serine, methyl ester and 15.7 ml (0.012 mol) of triethylamine in 100 ml of CH2Cl2, cooled to 0° C., was added portionwise 6.64 g (32.14 mmol) of 4-methoxybenzenesulfonyl chloride. The mixture was then stirred under argon at room temperature for 2 days. The mixture was diluted with 100 ml of CH2Cl2 and then washed with 60 ml each of H2O, 2 N citric acid, brine and dried with Na2SO4. The solvent was removed under vacuum to give a solid. Crystallization from ethyl acetate gave 5.0 g (54%) of white crystals, m.p. 92-94° C. Anal. for C11H15NO6S: Calc'd: C, 45.7; H, 5.2; N, 4.8; S, 11.1; Found: C, 45.6; H, 5.2; N, 4.8; S, 11.1.

1. washwashed with 60 ml each of H2O, 2 N citric acid, brine
2. dry with materialdried with Na2SO4
3. customThe solvent was removed under vacuum
4. customto give a solid
5. customCrystallization from ethyl acetate