m-Chloroperbenzoic acid → 5-Bromo-2-[(2,6-dichlorophenyl)methanesulfinyl]-1-oxo-1lambda~5~-pyridine

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Reaction Steps

2.3 g of 5-bromo-2-(2,6-dichlorobenzylthio)pyridine-N-oxide was dissolved in 50 ml of chloroform, and a solution of 1.6 g of metachloroperbenzoic acid (content: 70%) dissolved in 30 ml of chloroform was added dropwise thereto at 5° to 10° C. over 10 minutes. The mixture was stirred at 5° to 10° C. for an additional 2 hours. The resulting mixture was washed twice with potassium carbonate solution and dried over magnesium sulfate. The chloroform was evaporated, and the residue was recrystallized from benzene to obtain 2.0 g of 5-bromo-2-(2,6-dichlorobenzylsulfinyl)pyridine-N-oxide (Compound (2)). Yield, 83%. M.P., 187.5°-188.5° C.

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