反应详情

To a stirred solution of nucleoside 16 (0.60 g, 1.28 mmol) in dichloromethane (70 cm3) at room temperature was added 4—N,N-(dimethylamino)pyridine (0.63g, 5.12 mmol) and p-toluenesulphonyl chloride (0.73 g, 3.84 mmol). After stirring for 3 h, ice-cold H2O (50 cm3) was added and extraction was performed using dichloromethane (3×75 cm3). The combined organic phase was dried (Na2SO4) and evaporated to dryness under reduced pressure. The residue was purified by silica gel column chromatography using dichloromethane/methanol (99.5:0.5, v/v) as eluent to give nucleoside 17 as white solid material (0.71 g, 71%) after evaporation of the solvents under reduced pressure.

1. extractionextraction
2. dry with materialThe combined organic phase was dried (Na2SO4)
3. customevaporated to dryness under reduced pressure
4. customThe residue was purified by silica gel column chromatography