Dimethyl Sulfate → 5-Fluoro-2-nitroanisole

Participants

Reaction Steps

A mixture of 5-fluoro-2-nitrophenol (3.0 g, 19.1 mmol), potassium carbonate (2.50 g, 21.0 mmol) and dimethyl sulfate (2.65 g, 21.0 mmol) in acetone was stirred at ambient temperature for 24 hours. The solvents were removed under reduced pressure and then water (30 mL) and dichloromethane (30 mL) was added to the residue. The combined organics solutions were dried over magnesium sulfate then filtered and the filtrate concentrated under reduced pressure to provide an oil. This was purified by flash chromatography on silica gel using dichloromethane/heptane (7:3) as an eluent to provide the title compound as a crystalline solid (3.24 g, 100%): 1H NMR (CDCl3, 400 MHz) δ 7.96 (M, 1H), 6.80 (m, 1H), 6.73 (m, 1H), 3.96 (s, 3H); RP-HPLC (Hypersil HS C18, 5 μm, 100 A, 250×4.6 mm; 5%-100% acetonitrile-0.05 M ammonium acetate over 25 min, 1 μL/min) tr 17.82 min; MS: MH+ 172.2

Provenance & Evidence