Butyl iodide → 6-Amino-2-(4-chloro-2-fluoro-3-methoxyphenyl)-5-vinyl-pyrimidine-4-carboxylic acid butyl ester

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6-Amino-2-(4-chloro-2-fluoro-3-methoxyphenyl)-5-vinyl-pyrimidine-4-carboxylic acid (0.150 g, 0.46 mmol), iodobutane (0.111 g, 0.60 mmol), and lithium carbonate (0.044 g, 0.6 mmol) were combined in DMF (1.5 mL) and heated at 60° C. overnight. The cooled reaction mixture was concentrated and partitioned between ethyl acetate and water. The organic phase was dried and concentrated. The product was purified by flash chromatography on silica gel (ethyl acetate/hexane gradient) to yield the title compound (0.092 g, 52.3% yield): 1H NMR (CDCl3) δ 7.65 (dd, 1H), 7.19 (dd, 1H), 7.75 (dd, 1H), 5.62-5.67 (m, 2H), 5.35 (br s, 2H), 4.34 (t, 3H), 3.99 (dd, 3H), 1.74 (m, 2H), 1.45 (m, 2H), 0.97 (t, 3H).

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