反应详情

To a stirred solution of (2S,4S)-1-cyclohexylmethyl-4-[(1-hydroxy-naphthalene-2-carbonyl)-amino]-pyrrolidine-2-carboxylic acid methyl ester (350 mg, 0.85 mmol) in methanol (8 mL) was added lithium hydroxide (204 mg, 8.53 mmol) and the mixture was stirred at room temp. for 24 h. The reaction mixture was then acidified with dilute hydrochloric acid, extracted with ethyl acetate and washed with water and brine. The organic layer was dried over anhydrous sodium sulfate, filtered, concentrated and purified by column chromatography (using 15% EtOAc in hexane as eluent) to give (2S,4S)-1-cyclohexylmethyl-4-[(1-hydroxy-naphthalene-2-carbonyl)-amino]pyrrolidine-2-carboxylic acid (250 mg, 74.0% yield) as a white solid. MS calcd. for C23H29N2O4 [(M+H)+] 397.0, obsd. 397.6.

1. extractionextracted with ethyl acetate
2. washwashed with water and brine
3. dry with materialThe organic layer was dried over anhydrous sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. custompurified by column chromatography (using 15% EtOAc in hexane as eluent)