C(=O)([O-])[O-].[K+].[K+].Cl[C:8]([F:13])([F:12])C([O-])=O.[Na+].CN(C=O)C.[Br:20][C:21]1[CH:26]=[CH:25][C:24]([OH:27])=[CH:23][N:22]=1>CCOCC>[Br:20][C:21]1[CH:26]=[CH:25][C:24]([O:27][CH:8]([F:12])[F:13])=[CH:23][N:22]=1Potassium carbonate (2.4 g, 17.3 mmols) and sodium chlorodifluoroacetate (4.2 g, 27.5 mmols) were added to a DMF (20 mL) solution of 2-bromo-5-hydroxypyridine (2.4 g, 13.8 mmols) and stirred overnight at 80° C. The reaction liquid was cooled to room temperature, added ether, washed with water and dried over anhydrous magnesium sulfate. Concentrating the solvent under reduced pressure, the resulting residue was purified on silica gel column chromatography (C-300; hexane:ethyl acetate=100:1-100:2) to provide the title compound (1.32 g, 43%).
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