反应详情

To a solution of (2S,4R)-4-hydroxy-2-(1-methyl-1H-tetrazol-5-yl)thiomethyl-1-(4-nitrobenzyloxycarbonyl)pyrrolidine (1.23 g) and triphenylphosphine (1.23 g) in tetrahydrofuran (25 ml) was added dropwise a solution of diethyl azodicarboxylate (0.74 ml) in tetrahydrofuran (2 ml) under ice-cooling. After stirring at the same temperature for 30 minutes, to the solution was added thiobenzoic S-acid (0.55 ml) under ice-cooling. The mixture was stirred at the same temperature for 2 hours. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was dissolved in ethyl acetate (100 ml) and the solution was washed with saturated aqueous sodium hydrogen carbonate and saturated aqueous sodium chloride successively, dried over anhydrous magnesium sulfate, and evaporated in vacuo. The resulting residue was chromatographed on silica gel (100 g) eluting with a mixture of dichloromethane and acetone (19:1, V/V). The fractions containing the resired compound were collected and evaporated in vacuo to give (2S,4S)-4-benzoylthio-2-(1-methyl-1H-tetrazol- 5-yl)thiomethyl-1(4-nitrobenzyloxycarbonyl)pyrrolidine (1.61 g).

1. temperaturecooling
2. temperaturecooling
3. stirringThe mixture was stirred at the same temperature for 2 hours
4. concentrationThe reaction mixture was concentrated under reduced pressure
5. customto give a residue
6. washthe solution was washed with saturated aqueous sodium hydrogen carbonate and saturated aqueous sodium chloride successively
7. dry with materialdried over anhydrous magnesium sulfate
8. customevaporated in vacuo
9. customThe resulting residue was chromatographed on silica gel (100 g)
10. washeluting with a mixture of dichloromethane and acetone (19:1, V/V)
11. additionThe fractions containing the resired compound
12. customwere collected
13. customevaporated in vacuo