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6-Amino-2-(4-chloro-2-fluoro-3-methoxyphenyl)-5-vinyl-pyrimidine-4-carboxylic acid methyl ester (0.611 g, 1.809 mmol) and N-bromosuccinimide (0.386 g, 2.171 mmol) were dissolved in dichloromethane (10 ml) and the reaction mixture was cooled to 0° C. Triethylamine trihydrofluoride (0.884 mL, 5.43 mmol) was then added dropwise and the reaction mixture was allowed to warm to ambient temperature and stirred overnight. Water and additional dichloromethane were added. Sodium bicarbonate (0.760 g, 9.05 mmol) was added in several portions until no further gas evolution was noted. The organic phase was dried and concentrated under vacuum. The product was purified by flash chromatography on silica gel twice (first with dichloromethane/ethyl acetate gradient followed by hexane/ethyl acetate gradient) to provide the title compound (352 mg, 0.806 mmol, 44.6% yield) as a white solid, mp 144-146° C.: 1H NMR (CDCl3) δ 7.67 (dd, 1H), 7.23 (dd, 1H), 6.32 (ddd, 1H), 5.77 (br s, 2H), 4.01 (s, 3H), 4.0 (d, 3H), 3.77-3.94 (m, 2H).

1. temperatureto warm to ambient temperature
2. customThe organic phase was dried
3. concentrationconcentrated under vacuum
4. customThe product was purified by flash chromatography on silica gel twice (first with dichloromethane/ethyl acetate gradient followed by hexane/ethyl acetate gradient)