反应详情

Methyl iodide (580 TL, 10.06 mmol) and K2CO3 (2.80 g, 20.12 mmol) were added to a solution of 4-bromo-2,6-difluorophenol (1.05 g, 5.03 mmol) in DMF (10 mL) and stirred at rt under Ar for 24 h. Upon completion, ethyl acetate was added and the reaction was washed with 1% HCl (2×20 mL), brine (1×), dried over MgSO4 and concentrated in vacuo. The residue was purified by flash chromatography (hexane) to afford 4-bromo-2,6-difluoroanisole (747 mg, 67%) as a white solid. See, for example, Chambers, R. D.; et al. J. Fluorine Chem. 2000, 102, 169-174, which is incorporated by reference in its entirety. 1H NMR (CDCl3, 400 MHz) δ 7.06 (m, 2H), 3.97 (q, 3H, J=1.1 Hz). 13C NMR (CDCl3, 100 MHz) δ 155.8, 136.3, 116.2, 113.8, 61.9. LREIMS found for C7H5F2OBr (M+) 223.0.

1. washthe reaction was washed with 1% HCl (2×20 mL), brine (1×)
2. dry with materialdried over MgSO4
3. concentrationconcentrated in vacuo
4. customThe residue was purified by flash chromatography (hexane)