反应详情

2-[(5-bromo-2-chloro-3-fluorophenyl)oxy]-1-chloro-3-fluoro-4-methylbenzene (13.25 g, 36.0 mmol) and NBS (6.41 g, 36.0 mmol) were combined in carbon tetrachloride (150 mL) with a catalytic amount of AIBN (0.296 g, 1.800 mmol) and stirred at reflux for 16 h. The reaction mixture was washed with water, dried over MgSO4, filtered and concentrated to dryness. The residue was purified by chromatography on 330 g silica gel eluted with 0 to 10% Et2O in hexanes to give the desired product, 2-[(5-bromo-2-chloro-3-fluorophenyl)oxy]-4-(bromomethyl)-1-chloro-3-fluorobenzene (10.04 g, 22.47 mmol, 62.4% yield), as a white solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 7.53-7.67 (m, 3H), 6.78 (s, 1H), 4.75 (s, 2H).

1. temperatureat reflux for 16 h
2. washThe reaction mixture was washed with water
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated to dryness
6. customThe residue was purified by chromatography on 330 g silica gel
7. washeluted with 0 to 10% Et2O in hexanes