m-Chloroperbenzoic acid → 3-Bromo-2-methylpyridine N-oxide

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-bromo-2-methylpyridine (5 g, 29.1 mmol) in DCM (50 ml) was added portionwise at 0° C. m-chloroperbenzoic acid (70%, 8.6 g, 34.9 mmol). The solution was stirred at 0° C. for three hours and then at room temperature overnight. The mixture was filtered, the residue was washed with DCM and the combined DCM phases were quenched with a 10% solution of sodium thiosulfate. The phases were separated, the organic phase was washed with a saturated solution of sodium bicarbonate and brine, dried (sodium sulfate) and concentrated under reduced pressure. The residue was purified by column chromatography (silica, diethyl ether, then DCM/methanol 95:5) to yield 4.44 g (23.6 mmol, yield 81%) MS (multi-mode) m/z=190.0 [M+1]+.

Provenance & Evidence