Sodium Iodide → HCID 22877785, compound

Participants

Reaction Conditions

Reaction Steps

713 mg (2 mmol) of 3'-O-[(1,1-dimethylethyl)dimethylsilyl]thymidine [Can. J. Chem., 56, 2768 (1978)] were dissolved in 5 ml of tetrahydrofuran, and 175 mg (4 mmol) of sodium hydride (as a 55% w/w dispersion in mineral oil) were added to the resulting solution under an argon atmosphere. The mixture was then stirred at 60° C. for 2 hours. At the end of this time, the temperature of the mixture was reduced to room temperature, and then 678 mg (2 mmol) of 3,4-dibenzyloxybenzyl chloride was added, followed by 149.9 mg (1 mmol) of sodium iodide, and the resulting mixture was stirred at room temperature for 19 hours, and then at 60° C. for 5 hours. At the end of this time, the solvent was distilled off under reduced pressure, and the residue was dissolved in 50 ml of ethyl acetate. The resulting solution was washed twice, each time with 50 ml of 0.01N aqueous hydrochloric acid; it was then dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure. The residue was dissolved in 4 ml of tetrahydrofuran, and 4 ml of a 1M solution of tetrabutylammonium fluoride in tetrahydrofuran was added to the solution. The mixture was then stirred at room temperature for 2 hours. At the end of this time, the solvent was removed by distillation under reduced pressure, and the residue was dissolved in 50 ml of ethyl acetate. The resulting solution was washed twice, each time with 50 ml of a saturated aqueous solution of sodium chloride and dried over anhydrous magnesium sulfate. The solvent was then removed by distillation under reduced pressure, and the residue was applied to a chromatography column [LiChroprep (trade mark) Si60, 40-63 μm, Groβe C, Merck] and eluted using a gradient elution method, with methylene chloride containing from 1 to 4% by volume of methanol, to give 345.4 mg (yield 31.7%) of the title compound.

Provenance & Evidence