Dimethyl Sulfoxide → (2R,3R,4R,5R)-3,4-bis{[tert-butyl(dimethyl)silyl]oxy}-5-[3-(4-methoxybenzyl)-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl]-tetrahydro-furan-2-carbaldehyde

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Following the literature procedure (Myers, A. G.; Gin, D. Y.; Rogers, D. H., J. Amer. Chem. Soc., 1994, 116, 4697-4718), anhydrous dimethyl sulfoxide (3.35 ml, 47.23 mmole) was added dropwise to a solution of oxalyl chloride (14.2 ml, 28.34 mmole, 2.0 M solution in methylene chloride, Aldrich) in anhydrous methylene chloride (50 ml) under argon at −78° C. The resulting mixture was stirred at −78° C. for 45 min, and was transferred via cannula to a cooled (−78° C.) solution of 1-[(2R,3R,4R,5R)-3,4-bis{[tert-butyl(dimethyl)silyl]oxy}-5-(hydroxymethyl)tetrahydro-2-furanyl]-3-(4-methoxybenzyl)-2,4(1H,3H)-pyrimidinedione (5.6 g, 9.45 mmole, obtained from Reference Example 2) in anhydrous methylene chloride (50 ml) under argon. The resulting mixture was stirred at −78° C. for 1 h, and triethylamine (9.9 ml, 70.8 mmole) was added all at once. The mixture was stirred at −78° C. for 1.5 h under argon, and diluted with ethyl acetate (500 ml). The organic layer was washed with saturated sodium bicarbonate aqueous solution and saturated sodium chloride solution, dried over magnesium sulfate, filtered and concentrated to dryness in vacuo. Toluene was added to the residue, and evaporated in vacuo. This procedure was repeated for two more times, to give 1-[(2R,3R,4R,5R)-3,4-bis{[tert-butyl(dimethyl)silyl]oxy}-5-[3-(4-methoxybenzyl)-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl]-tetrahydro-furan-2-carbaldehyde as pale yellow solid (5.31 g, 95%). This material was used in its crude form in the following experiment. MS (ES): m/z 591.3 (M+H).

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