m-Chloroperbenzoic acid → Methyl 2-fluoro-4-[3-(methylsulfinyl)-1,2,4-triazin-6-yl]benzoate

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Reaction Steps

To a cooled (0° C.) solution of methyl 2-fluoro-4-[3-(methylthio)-1,2,4-triazin-6-yl]benzoate (0.180 g, 0.000644 mol) in methylene chloride (10 mL) was added m-chloroperbenzoic acid (0.32 g, 0.0014 mol) in DCM (3 ml) with stirring. The mixture was stirred at 0° C. for 1.5 h, and diluted with DCM. The resulting solution was quenched with saturated Na2S2O3 solution. After separation the organic layer was washed with saturated NaHCO3 solution, brine; and dried over Na2SO4. After filtration the filtrate was concentrated to yield nearly quantitative product which was directly used in the next step without further purification. Analytical LCMS: (M+H)+=296.0.

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