Floxuridine → 3'-O-(3-chlorobenzyl)-2'-deoxy-5-fluorouridine

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A 2.00 g quantity of potassium hydroxide was dissolved in a mixture of 75 ml of water and 40 ml of dioxane. To the solution were added 1.00 g of 2'-deoxy-5-fluorouridine and 2.50 g of 3-chlorobenzyl chloride, and the resulting mixture was stirred at 45° C. for 3 days. After the reaction, the same subsequent procedure as in Reference Examples 4 and 5 was carried out, and the residue was placed on a silica gel column to conduct a gradient elution with chloroform and mixtures of methanol (up to 2%) and chloroform, thereby producing 0.21 g of the title compound in a yield of 14%.

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