Sodium hydride → 1-[3-(tert-Butyl-dimethyl-silanyloxy)-propyl]-5-(3-methyl-thiophen-2-yl)-1H-pyrimidine-2,4-dione

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To a suspension of 5-(3-methyl-thiophen-2-yl)-1H-pyrimidine-2,4-dione (Prep26, 110 mg, 0.52 mmol) in dry DMF (10 mL), 60% NaH (31 mg, 0.78 mmol) was added. The mixture was then heated at 100° C. for 1 hour. (3-bromo-propoxy)-tert-butyl-dimethyl-silane (180 μl, 0.7 mmol) was then added at room temperature and the reaction was stirred overnight. The solvent was evaporated and the crude was partitioned between NaHCO3 and Et2O. The organic phase was dried (Na2SO4) and evaporated. The crude was purified by flash chromatography with ethyl acetate-petroleum ether (2-8) to give the title compound as a white solid (73 mg, 37% yield).

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