反应详情

1-(3′-hydroxypropyl)uracil (0.193 g, 1.134 mmol) was dissolved in dry pyridine (4 mL) and cooled in an ice-salt bath. A solution of triphenylsilyl chloride (0.432 g, 1.46 mmol) in dry pyridine (3 mL) was added drop-wise. The reaction mixture was kept at 0° C. under nitrogen for 4 h30. As TLC monitoring evidenced the presence of unreacted starting material, more triphenyl silyl chloride (0.204 g, 0.69 mmol) in dry pyridine (1 mL) was added. After a further 15 min at 0° C., the reaction had reached completion and was quenched with CH3OH (50 μL). Removal of the solvent in vacuo afforded a crude yellow oil which was purified by silica gel chromatography, using a Jones Chromatography Isolute SI column eluted with a gradient of 0→5% CH3OH in CHCl3. The title compound was obtained as a white solid (0.392 g, 81%) from the fractions with Rf=0.52 (10% CH3OH/CHCl3). Some compound starting material was also recovered (34 mg, 18%).

1. temperaturecooled in an ice-salt bath
2. customwas kept at 0° C. under nitrogen for 4 h30
3. additionwas added
4. customwas quenched with CH3OH (50 μL)
5. customRemoval of the solvent in vacuo
6. customafforded a crude yellow oil which
7. customwas purified by silica gel chromatography
8. washeluted with a gradient of 0→5% CH3OH in CHCl3