m-Chloroperbenzoic acid → 3-Bromo-2-chloro-6-methylpyridin-1-ium-1-olate

Participants

Reaction Conditions

Reaction Steps

step a—To a solution of 3-bromo-2-chloro-6-methyl-pyridine (2.0 g, 0.687 mmol) in CHCl3 was added MCPBA (3.3 g, 19.1 mmol) and the resulting solution was heated at 50° C. overnight, The resulted solution was cooled and partitioned between DCM and sat'd. aq. NaHCO3. The organic layer was dried (Na2SO4), filtered and concentrated in vacuo. The crude product was purified by SiO2 chromatography eluting with an EtOAc/hexane gradient (30 to 80% EtOAc) to afford 1.88 g (87%) of 3-bromo-2-chloro-6-methyl-pyridine 1-oxide (52a) as a white solid.

Provenance & Evidence