反应详情

To a solution of D-valine benzyl ester hydrochloride (2.4 grams, 10 mmol) and triethylamine (2.5 grams, 3.5 mL, 25 mmol) in water (50 mL) and 1,4-dioxane (50 mL) is added 4-methoxybenzenesulfonyl chloride (2.3 grams, 11 mmol). The mixture was stirred at room temperature for 1 hour and then most of the solvent was removed by evaporation under vacuum. The mixture was diluted with ethyl acetate and was washed successively with dilute hydrochloric acid solution, water and brine. The organic solution was dried over magnesium sulfate and concentrated to leave N-(4-methoxybenzenesulfonyl)-D-valine benzyl ester as a white solid, 3.6 grams (97%); m.p. 92-94° C.

1. custommost of the solvent was removed by evaporation under vacuum
2. additionThe mixture was diluted with ethyl acetate
3. washwas washed successively with dilute hydrochloric acid solution, water and brine
4. dry with materialThe organic solution was dried over magnesium sulfate
5. concentrationconcentrated