m-Chloroperbenzoic acid → 5-Acetylamino-1-{2-fluoro-4-methyl-5-(2,2,2-trifluoroethylsulfinyl)phenyl}-3-(2,2,3,3,4,4,5,5,5-nonafluoropentyloxy)pyrazole

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Reaction Steps

0.2 g of 5-acetylamino-1-{2-fluoro-4-methyl-5-(2,2,2-trifluoroethylthio)phenyl}-3-(2,2,3,3,4,4,5,5,5-nonafluoropentyloxy)pyrazole was dissolved in 10 mL of chloroform, and 77 mg of m-chloroperbenzoic acid (purity: 75%) was added under cooling with ice. After stirring for 30 minutes under cooling with ice, the solution was washed with an aqueous sodium thiosulfate solution and then washed with an aqueous potassium carbonate solution, and then dried over anhydrous magnesium sulfate. Then, the solvent was distilled off under reduced pressure, and the obtained residue was purified by column chromatography (developing solvent ethyl acetate:hexane=1:2) to obtain 0.19 g of 5-acetylamino-1-{2-fluoro-4-methyl-5-(2,2,2-trifluoroethylsulfinyl)phenyl}-3-(2,2,3,3,4,4,5,5,5-nonafluoropentyloxy)pyrazole.

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