Pyridine → 1-(3-O-Benzyl-2,5di-O-methanesulfonyl-4-C-(methanesulfonyloxymethyl)-beta-D-xylofuranosyl)thymine

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To a solution of nucleoside 5 (1100 mg, 2.91 mmol) in anhydrous tetrahydrofuran (20 cm3) was added anhydrous pyridine (5 cm3) followed by methanesulfonyl chloride (1.2 ml, 15.5 mmol). The mixture was stirred under a nitrogen atmosphere for 18 h at room temperature. The reaction mixture was evaporated to dryness under reduced pressure and dissolved in ethyl acetate. The organic phase was washed with saturated aqueous solution of sodium hydrogen carbonate (3×10 cm3) and dried (Na2SO4). The organic phase was evaporated to dryness under reduced pressure. The residue was purified by silica gel column chromatography using dichloromethane/methanol (2% methanol, v/v) as elutxnt to afford nucleoside 11 (908 mg, 51%). δC (CDCl3) 163.3, 150.6, 135.6, 134.6, 128.7, 128.3, 112.2, 87.9, 85.0, 83.1, 80.9, 77.2, 76.9, 76.6, 73.3, 66.6, 66.2, 38.6, 37.6, 37.6, 12.2.

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