m-Chloroperbenzoic acid → 4-Chloromethyl-2-[2-(4-trifluoromethylsulfinyl-phenyl)-vinyl]-oxazole

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A mixture of 17.6 g (55 mmol) 4-chloromethyl-2-[2-(4-trifluoromethylsulfanyl-phenyl)-vinyl]-oxazole and 14.93 g (60 mmol) 3-chloro-benzenecarboperoxoic acid in 200 ml dichloromethane was stirred at room temperature over night. After filtration, the filtrate was washed three times with sodium hydroxide solution, then with water, dried over sodium sulfate, filtered and evaporated. Purification on silica, after elution with heptane/ethyl acetate 5:1, yielded 5.78 g (31%) 4-chloromethyl-2-[2-(4-trifluoromethanesulfinyl-phenyl)-vinyl]-oxazole as off-white solid melting at 102-104° C.

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