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(a) (4,6-dimethoxypyrimidin-2-yl)acetic acid n-Butyllithium (200 ml of 2N in pentane) was added dropwise over 30 minutes to a stirred solution of di-isopropylamine (40.4 g) in tetrahydrofuran (200 ml) at -70 C. under nitrogen. The mixture was stirred for 20 minutes and then <strong>[13566-48-8]4,6-dimethoxy-2-methylpyrimidine</strong> (61.6 g) in tetrahydrofuran (200 ml) was added dropwise over 20 minutes. The mixture was stirred at -70 C. for 30 minutes before being poured onto a large excess of solid carbon dioxide. The mixture was allowed to warm to room temperature before water (800 ml) was added. The clear solution was concentrated to half volume under vacuum and was then washed with ether. The aqueous phase was acidified with concentrated hydrochloric acid and the resulting solid was filtered, washed with water and dried to give 58.3 g of (4,6-dimethoxypyrimidin-2-yl)acetic acid.
With N-Bromosuccinimide; 2,2'-azobis(isobutyronitrile); In tetrachloromethane; at 80 - 100℃; for 20.0h;
4,6-Dimethoxy-2-methylpyrimidine (5 g, 32.4 mmol) was dissolved in 443 carbon tetrachloride (54.1 mL) and 61 N-bromosuccinimide (5.77 g, 32.4 mmol) and 444 azobisisobutyronitrile (0.266 g, 1.622 mmol) were added sequentially to the pressure tube, which was sealed and heated to 80 C. for 4 hours and 100 C. for 16 hours. The reaction vessel was cooled to ambient temperature, concentrated in vacuo, and the resulting crude material was purified via flash chromatography, eluting with 0:100 to 25:75 ethyl acetate:heptanes on a 120 g silica gel column over 20 minutes to provide the 445 title compound. 1H NMR (400 MHz, CDCl3) delta ppm 5.92 (s, 1H), 4.39 (s, 2H), 3.95 (s, 6H); MS (ESI+) m/z 235.0 (M+H)+.
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