[Br:1][C:2]1[CH:3]=[C:4]([C:11]([F:14])([F:13])[F:12])[C:5]([OH:10])=[C:6]([CH:9]=1)[CH:7]=[O:8].[C:15](=O)([O-])[O-].[K+].[K+].COS(=O)(=O)OC.O>CN(C)C=O>[Br:1][C:2]1[CH:3]=[C:4]([C:11]([F:12])([F:13])[F:14])[C:5]([O:10][CH3:15])=[C:6]([CH:9]=1)[CH:7]=[O:8]5-bromo-2-hydroxy-3-trifluoromethylbenzaldehyde (63.98 g) was dissolved in N,N-dimethylformamide (130 mL), and potassium carbonate (65.79 g) and dimethylsulfuric acid (31.6 mL) were added to the solution under water cooling, and then the mixture was stirred at room temperature for 3 hours. Water was added to the reaction solution, and then the mixture was extracted with ethyl acetate. The organic layer was washed with 1N hydrochloric acid and saturated brine, and then dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure to obtain the title compound (66.19 g) as a brown crystal.
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