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-B) (175 mg, 0.418 mmol) obtained in Example 43 was dissolved in methylene chloride (10 ml). Under ice cooling, 3-chloroperbenzoic acid (87 mg, 0.50 mmol) was added. The resulting mixture was stirred at room temperature for 14 hours. The residue obtained by concentrating the reaction mixture under reduced pressure was purified silica gel chromatography (methylene chloride:methanol=40:1) to yield a white solid. The resulting solid was washed with diethyl ether, whereby the title compound (118 mg, 65%) was obtained as a white powder.

Provenance & Evidence