反应详情

温度

120 °C

N,N-Dimethylformamide (20 ml) was added to 2-chloro-6-fluorophenyl acetic acid (3.77 g), 3,5-dimethoxyphenol (3.08 g), potassium carbonate (5.52 g), copper iodide (950 mg) and copper (250 mg), for stirring at 120° C. for 20 hours. The resulting solution was partitioned between ethyl acetate and dilute hydrochloric acid, and the organic phase was washed in water and in an aqueous saturated sodium chloride solution, and dried over anhydrous magnesium sulfate, to distill off the solvents under reduced pressure. The residue was purified by silica gel column chromatography (developing solvent: hexane:ethyl acetate=7:3), to recover 2-(3,5-dimethoxyphenoxy)-6-fluorophenyl acetic acid (5.27 g; yield of 86%). By 2H-NMR (90 MHz, CDCl3), the compound has the peaks shown below.

1. customThe resulting solution was partitioned between ethyl acetate and dilute hydrochloric acid
2. washthe organic phase was washed in water and in an aqueous saturated sodium chloride solution
3. dry with materialdried over anhydrous magnesium sulfate
4. distillationto distill off the solvents under reduced pressure
5. customThe residue was purified by silica gel column chromatography (developing solvent: hexane:ethyl acetate=7:3)