[Br:1][C:2]1[CH:7]=[CH:6][C:5]([OH:8])=[CH:4][C:3]=1[F:9].CN(C=O)C.C(=O)([O-])[O-].[K+].[K+].[CH2:21](Br)[C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1>O>[CH2:21]([O:8][C:5]1[CH:6]=[CH:7][C:2]([Br:1])=[C:3]([F:9])[CH:4]=1)[C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1To a mixed solution of a commercially available product of 4-bromo-3-fluorophenol (15.0 g, 78.5 mmol) and DMF (30 mL) were added potassium carbonate (21.7 g, 157 mmol) and benzyl bromide (10.2 mL, 86.4 mmol) at room temperature, and the resultant mixture was stirred at room temperature for 20 minutes and then at 70° C. for 40 minutes. The reaction mixture was cooled to room temperature, then water was added to the reaction mixture, and the resultant solution was extracted with ethyl acetate. An organic layer was washed with water and then with saturated brine. An organic layer was dried over anhydrous magnesium sulfate and then filtrated. The solvent was evaporated under a reduced pressure, and the resultant residue was purified by silica gel column chromatography (heptane:ethyl acetate=5:1) to give the title compound (22.7 g, yield: quantitative).
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