反应详情

To a solution of N-[4-methoxybenzenesulfonyl]-(D)-valine t-butyl ester (4.38 g, 13.0 mmol) in dimethylformamide (200 mL) is added 3-picolyl chloride hydrochloride (2.3 g, 14.0 mmol) followed by potassium carbonate (17.94 g, 130.0 mmol). The reaction mixture is stirred at room temperature for 2 days. The mixture is then diluted with water and extracted with ethyl acetate. The combined organic extracts are washed with brine, dried (Na2SO4), and the solvent is evaporated. The crude product is purified by silica gel chromatography (ethyl acetate) to give t-butyl 2(R)-[N-[4-methoxybenzenesulfonyl](3-picolyl)amino]-3-methylbutanoate.

1. extractionextracted with ethyl acetate
2. washThe combined organic extracts are washed with brine
3. dry with materialdried (Na2SO4)
4. customthe solvent is evaporated
5. customThe crude product is purified by silica gel chromatography (ethyl acetate)