[CH3:1][O:2][C:3](=[O:13])[C:4]1[CH:9]=[C:8]([F:10])[C:7]([OH:11])=[C:6]([Br:12])[CH:5]=1.C(=O)([O-])[O-].[K+].[K+].[CH3:20][O:21][CH2:22]Cl>CC(C)=O.C(OCC)(=O)C>[CH3:1][O:2][C:3](=[O:13])[C:4]1[CH:9]=[C:8]([F:10])[C:7]([O:11][CH2:20][O:21][CH3:22])=[C:6]([Br:12])[CH:5]=1To a solution of 3-bromo-5-fluoro-4-hydroxybenzoic acid methyl ester (637 mg) in acetone (7 mL) were added potassium carbonate (708 mg) and chloromethyl methyl ether (412 mg), and the mixture was stirred at room temperature overnight. The reaction mixture was diluted with ethyl acetate, washed with water and saturated brine, dried over anhydrous sodium sulfate, and concentrated in vacuo. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=9:1, v/v) to give the title compound (608 mg).
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