Trifluoroacetic anhydride → 3-Bromo-2-chloro-6-methylpyridin-1-ium-1-olate

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To a solution of 3-bromo-2-chloro-6-methylpyridine (1 g, 4.84 mmol) and urea hydrogen peroxide (911 mg, 9.69 mmol) in DCM (24 mL) at 0° C. was added trifluoroacetic anhydride (1.4 mL, 9.69 mmol). After warming to 25° C. over 12 h, the solution was partitioned between H2O-DCM. The aqueous phase was washed several times with DCM and the combined organic fractions were dried over Na2SO4, concentrated and purified via column chromatography (silica, 1% MeOH in DCM) yielding the title compound (1.1 g, quant.) as a white solid: LCMS (ES) m/z=223 (M+H)+.

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