反应详情

温度

0 °C

D-asparagine (13.2 g, 100.0 mmol) is dissolved in dioxane (75.0 mL) and water (125.0 mL), triethylamine (21.0 mL, 150.0 mmol) is added, and the solution is cooled to 0° C. To this solution is added 4-methoxybenzenesulfonyl chloride (22.7 g, 110.0 mmol) over 10 minutes. The reaction is warmed to room temperature and stirred for 3 days. The precipitate is then filtered off, the filtrate is acidified to pH=~4, and extracted well with ethyl acetate. A first crop of pure product precipitates from the ethyl acetate and is collected by filtration. A second crop is obtained by evaporating off the ethyl acetate, and rinsing the solid obtained with water to remove inorganic salts. The two crops are combined to give N-[4-methoxybenzenesulfonyl]-(D)-asparagine.

1. temperatureThe reaction is warmed to room temperature
2. filtrationThe precipitate is then filtered off
3. extractionextracted well with ethyl acetate
4. customA first crop of pure product precipitates from the ethyl acetate
5. filtrationis collected by filtration
6. customA second crop is obtained
7. customby evaporating off the ethyl acetate
8. washrinsing the solid
9. customobtained with water
10. customto remove inorganic salts