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A 1.50 g quantity of 5-fluorouridine (5.72 mmoles) was dissolved in 5 ml of N,N-dimethylformamide. To the solution were added 520 mg (7.64 mmoles) of imidazole and 633 mg (4.20 mmoles) of tert-butyldimethylsilyl chloride, and the reaction was conducted at room temperature for 15 hours. -The reaction mixture was ice-cooled, and 40 ml of water was added thereto. The reaction mixture was extracted three times with 40 ml of ethyl acetate. The organic layers were combined, washed three times with 50 ml of water and washed three times with 50 ml of a saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was evaporated off under reduced pressure, and the residue thus obtained was subjected to silica gel column chromatography (chloroform: methanol=20:1). The eluate was concentrated and the residue was recrystallized from ether, giving 1.3 g of the title compound as white crystals. Yield: 60%.

1. custom-The reaction mixture
2. temperaturecooled
3. extractionThe reaction mixture was extracted three times with 40 ml of ethyl acetate
4. washwashed three times with 50 ml of water
5. washwashed three times with 50 ml of a saturated aqueous sodium chloride solution
6. dry with materialdried over anhydrous magnesium sulfate
7. customThe solvent was evaporated off under reduced pressure
8. customthe residue thus obtained
9. concentrationThe eluate was concentrated
10. customthe residue was recrystallized from ether