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0 °C

1-(4-Hydroxy-butyl)-5-trifluoromethyl-1H-pyrimidine-2,4-dione (Prep 23, 44 mg, 0.17 mmol) was dissolved in dry THF (5 mL), the solution was cooled to 0° C. and Dess-Martin periodinane (127 mg, 0.28 mmol) was added. The mixture was stirred at 0° C. for 1.5 hours. Et2O was added and the solution washed with aqueous saturated NaHCO3. The organic phase was dried (Na2SO4) and evaporated. The crude was purified by flash chromatography with ethyl acetate-petroleum ether (1-1) to give 22 mg of the title compound (50% yield).

1. washthe solution washed with aqueous saturated NaHCO3
2. dry with materialThe organic phase was dried (Na2SO4)
3. customevaporated
4. customThe crude was purified by flash chromatography with ethyl acetate-petroleum ether (1-1)