1,8-Diazabicyclo(5.4.0)undec-7-ene → 2,2-Dimethyl-propionic acid 8-(4-acetylamino-benzyl)-3-butyl-1-(2-fluoro-5-methoxy-benzyl)-2,6-dioxo-1,2,3,6-tetrahydro-purin-7-ylmethyl ester

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A solution of 2,2-dimethyl-propionic acid 8-(4-acetylamino-benzyl)-3-butyl-2,6-dioxo-1,2,3,6-tetrahydro-purin-7-ylmethyl ester (100 mg, 0.21 mmol) and 2-bromomethyl-1-fluoro-4-methoxy-benzene (56 mg, 0.25 mmol) in acetonitrile (2.0 mL) was treated with 1,8-diazabicyclo[5.4.0]undec-7-ene (0.06 mL, 0.45 mmol). The reaction was stirred at 25° C. The reaction was diluted with ethyl acetate and was washed with a 1N aqueous hydrochloric acid solution and a saturated aqueous sodium chloride solution. The organics were dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230–400 mesh, 1:1 ethyl acetate/petroleum ether) afforded 2,2-dimethyl-propionic acid 8-(4-acetylamino-benzyl)-3-butyl-1-(2-fluoro-5-methoxy-benzyl)-2,6-dioxo-1,2,3,6-tetrahydro-purin-7-ylmethyl ester (26 mg, 20%) as a yellow solid. This material was taken on without further purification or characterization.

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