反应详情

A solution of (2S,4R)-4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)-2-[2-(4-nitrobenzyloxycarbonylamino)ethyloxymethyl]pyrrolidine (0.90 g) in dimethylformamide (2 ml) was added to a reaction mixture of thioacetic S-acid (0.16 ml) and sodium hydride (62.8% in oil suspension) (0.07 g) in dimethylformamide (9 ml) in a nitrogen stream and the mixture was heated at 70°-75° C. for 6 hours. The mixture was poured into water (100 ml), extracted with ethyl acetate (50 ml×2), 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 chloroform to give (2S,4S)-4-acetylthio-1-(4-nitrobenzyloxycarbonyl)-2-[2-(4-nitrobenzyloxycarbonylamino)ethyloxymethyl]pyrrolidine (0.60 g).

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