反应详情

38.1 A solution of 530 mg (3S,4S)-3-azido-4-hydroxy-pyrrolidine-1-carboxylic acid tert-butyl ester (example 22.2) in 5 ml pyridine was cooled to 0° C. under an argon atmosphere and treated with 664 mg 4-toluenesulfonyl chloride. The mixture was slowly warmed to room temperature and stirred for 6 hrs. The pyridine was distilled off. The residue was taken up in CH2Cl2 and 10% aq. Na2CO3. The organic phase was washed with H2O and brine, dried over MgSO4, filtered and concentrated. The crude product was purified by column chromatography (silica gel, gradient: cyclohexane->cyclohexane/EtOAc 7:3) to give 628 mg (3S,4S)-3-azido-4-(toluene-4-sulfonyloxy)-pyrrolidine-1-carboxylic acid tert-butyl ester as viscous yellow oil. MS 405.3 ([M+Na]+)

1. distillationThe pyridine was distilled off
2. washThe organic phase was washed with H2O and brine
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated
6. customThe crude product was purified by column chromatography (silica gel, gradient: cyclohexane->cyclohexane/EtOAc 7:3)