反应详情

温度

60 °C

3-bromo-4-[(2,4-difluorobenzyl)oxy]-6-methylpyridin-2(1H)-one (2 g, 6.06 mmol) was suspended in 1,4-dioxane (250 mL). α,α′-Dibromo-m-xylene (8 g, 30.3 mmol) was added followed by sodium hydride (0.3 g, 7.5 mmol, 60% in mineral oil). The reaction was heated to 60° C. and stirred for 16 hours. The reaction was filtered through Celite® and the filtrate was concentrated to an oil that was partitioned between water and dichloromethane and extracted with dichloromethane (4×250 mL). The organic extracts were combined, washed with brine, dried over Na2SO4, and filtered. The filtrate was concentrated to an oil, and purified by chromatography (silica gel, hexane/ethyl acetate) to yield a white solid (1.2 g, 38%). 1H NMR (400 MHz, CDCl3) δ 7.57 (app q, J=7.6 Hz, 1H); 7.28-7.25 (m, 2H); 7.17 (s, 1H); 7.08 (m, 1H); 6.94 (app dt, J=1.2, 9.6 Hz, 1H), 6.87-6.82 (m, 1H); 5.99 (s, 1H), 5.34 (s, 2H), 5.20 (s, 2H); 4.43 (s, 2H); 2.29 (s, 3H). ES HRMS m/z 511.9672 (M+H C21H17Br2F2NO2 requires 511.9667).

1. filtrationThe reaction was filtered through Celite®
2. concentrationthe filtrate was concentrated to an oil that
3. customwas partitioned between water and dichloromethane
4. extractionextracted with dichloromethane (4×250 mL)
5. washwashed with brine
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. concentrationThe filtrate was concentrated to an oil
9. custompurified by chromatography (silica gel, hexane/ethyl acetate)