m-Chloroperbenzoic acid → 2-[1-[(4-Chlorophenyl)sulfonyl]-2-methyl-5-(methylsulfinyl)pentyl]-1,4-difluorobenzene

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Reaction Steps

The 2-[1-[(4-chlorophenyl)sulfonyl]-2-methyl-5-(methylthio)pentyl]-1,4-difluorobenzene (Isomer 43-A) (180 mg, 0.430 mmol) obtained in Example 43 was dissolved in methylene chloride (10 ml). Under ice cooling, 3-chloroperbenzoic acid (89 mg, 0.52 mmol) was added, followed by stirring at room temperature for 14 hours. The residue obtained by concentrating the reaction mixture under reduced pressure was purified by silica gel chromatography (methylene chloride:methanol=40:1), whereby the title compound (172 mg, 92%) was obtained a colorless oil.

Provenance & Evidence