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A mixture of (2E)-3-[5-(4-fluorophenyl)-1-methyl-1H-pyrazol-4-yl]-N-{4-[(methylthio)methyl]phenyl}acrylamide (600 mg), m-chloroperbenzoic acid (387 mg) and tetrahydrofuran (50 mL) was stirred at 0° C. for 20 min. A saturated aqueous sodium sulfite solution was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated aqueous sodium hydrogen carbonate, and then with saturated brine, dried (MgSO4) and concentrated. The obtained solid was recrystallized from acetone-hexane to give (2E)-3-(5-(4-fluorophenyl)-1-methyl-1H-pyrazol-4-yl)-N-(4-((methylsulfinyl)methyl)phenyl)acrylamide (340 mg, yield 54%) as colorless prism crystals. melting point: 240-241° C.

1. extractionthe mixture was extracted with ethyl acetate
2. washThe ethyl acetate layer was washed with saturated aqueous sodium hydrogen carbonate
3. dry with materialwith saturated brine, dried (MgSO4)
4. concentrationconcentrated
5. customThe obtained solid was recrystallized from acetone-hexane