[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8]([OH:13])[C:9]([F:12])([F:11])[F:10])=[CH:4][CH:3]=1.[H-].[Na+].[F:16][C:17]([F:23])([F:22])[S:18](Cl)(=[O:20])=[O:19].O>C(OCC)C>[F:16][C:17]([F:23])([F:22])[S:18]([O:13][CH:8]([C:5]1[CH:6]=[CH:7][C:2]([Cl:1])=[CH:3][CH:4]=1)[C:9]([F:11])([F:12])[F:10])(=[O:20])=[O:19]1-(4-Chlorophenyl)-2,2,2-trifluoroethanol (1.20 g, 5.70 mmol) was dissolved in diethyl ether (80 mL), and the resulting solution was cooled to 0° C. Then, 63% sodium hydride (217 mg, 5.70 mmol) was added thereto, and the resulting mixture was stirred for 1 hour. Thereafter, trifluoromethanesulfonyl chloride (0.910 mL, 8.55 mmol) was added dropwise thereto. Then, the temperature of the reaction solution was raised to room temperature, and the reaction solution was stirred for 2 hours. Water was added to the reaction solution, and the organic matter was extracted with ethyl acetate. The organic layer was washed with water and a saturated sodium chloride solution, then dried over anhydrous magnesium sulfate and filtered. Then, the solvent was distilled off under reduced pressure, whereby a crude product was obtained. This crude product was purified by silica gel column chromatography (hexane:ethyl acetate=100:0 to 93:7 (v/v)), whereby the objective title compound was obtained as a colorless oily substance (495 mg, yield: 25%).
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