反应详情

A solution of (2S,4R)-2-(carbamoylmethyl)oxymethyl-4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)pyrrolidine (0.98 g) in dimethylformamide (2 ml) was added to a reaction mixture of thioacetic S-acid (0.25 ml) and sodium hydride (62.8% in oil suspension) (0.11 g) in dimethylformamide (10 ml) in a nitrogen stream and the mixture was heated at 70°-75° C. for 3 hours. The mixture was poured into water (100 ml), extracted with ethyl acetate (50 ml×3), dried over magnesium sulfate and concentrated under reduced pressure to give a syrup. The syrup was subjected to a column chromatography on silica gel (20 g) and eluted with a mixture of methanol and chloroform (1:99 v/v) to give (2S,4S)-4-acetylthio-2-(carbamoylmethyl)oxymethyl-1-(4nitrobenzyloxycarbonyl)pyrrolidine (0.72 g).

1. temperaturethe mixture was heated at 70°-75° C. for 3 hours
2. extractionextracted with ethyl acetate (50 ml×3)
3. dry with materialdried over magnesium sulfate
4. concentrationconcentrated under reduced pressure
5. customto give a syrup
6. washeluted with a mixture of methanol and chloroform (1:99 v/v)