[CH3:1][O:2][C:3](=[O:16])[C:4]1[CH:13]=[C:12]([Br:14])[C:11]([OH:15])=[C:6]([C:7]([O:9][CH3:10])=[O:8])[CH:5]=1.C(N(C(C)C)CC)(C)C.[CH3:26][O:27][CH2:28]Cl>C(Cl)(Cl)Cl>[CH3:1][O:2][C:3](=[O:16])[C:4]1[CH:13]=[C:12]([Br:14])[C:11]([O:15][CH2:26][O:27][CH3:28])=[C:6]([C:7]([O:9][CH3:10])=[O:8])[CH:5]=1To a solution of 5-bromo-4-hydroxyisophthalic acid dimethyl ester (12.3 g) in chloroform (130 mL) were successively added diisopropylethylamine (8.24 g) and methoxymethyl chloride (4.11 g) under ice-cooling, and the mixture was stirred at room temperature overnight. The reaction solution was washed successively with 1N hydrochloric acid, water, and saturated brine, dried over anhydrous sodium sulfate, and concentrated. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=5:1, v/v) to give the title compound (8.52 g).
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