反应详情

To a −40° C. solution of tert-butyl (4R)-4-{(1R,2R)-3-[(4R)-4-benzyl-2-oxo-1,3-oxazolidin-3-yl]-2-cyclopropyl-1-hydroxy-3-oxopropyl}-2,2-dimethyl-1,3-oxazolidine-3-carboxylate (1.80 g, 3.68 mmol) in anhydrous DCM (10 mL), 2,6-lutidine (0.85 mL, 7.3 mmol) was added under an atmosphere of nitrogen. After 10 min., a solution of tert-butyldimethylsilyl trifluoromethanesulfonate (1.1 mL, 4.9 mmol) in anhydrous DCM (1 mL) was added. The reaction mixture was allowed to warm gradually to ambient temperature while stirring overnight. The crude reaction mixture was diluted with 1,2-dichloroethane and cooled to 0° C. prior to quenching with saturated NaHCO3 (aq.). Upon separation of the two layers that resulted, the organic layer was washed with water and brine, dried over Na2SO4, concentrated under reduced pressure and purified by flash chromatography (120 g silica gel, eluting with 0-30% EtOAc/hexanes) to afford the sub-title compound (2.1 g, 95%). LC/MS (ESI) m/z calc. for C32H50N2O7SiNa: 625.3 [M+Na]+. found 625.1.

1. customThe crude reaction mixture
2. temperaturecooled to 0° C.
3. customto quenching with saturated NaHCO3 (aq.)
4. customUpon separation of the two layers
5. customthat resulted
6. washthe organic layer was washed with water and brine
7. dry with materialdried over Na2SO4
8. concentrationconcentrated under reduced pressure
9. custompurified by flash chromatography (120 g silica gel, eluting with 0-30% EtOAc/hexanes)