m-Chloroperbenzoic acid → 2-[(Z)-C-(4-chloro-5-fluoro-2-hydroxyphenyl)-N-[(2-methylpropan-2-yl)oxy]carbonimidoyl]-1-oxidopyridin-1-ium-3-ol

Participants

Reaction Steps

To a solution of (Z)-2-(4-chloro-5-fluoro-2-hydroxybenzoyl)-3-hydroxypyridine O-t-butyloxime (0.82 g) in chloroform (30 ml) was added 70% m-chloroperbenzoic acid (1.01 g) at 0° C. The mixture was warmed up to room temperature and stirred for 5 hours. To the reaction mixture was added an aqueous solution of sodium hydrogensulfite to quench the reaction. The reaction mixture was subjected to extraction with chloroform. The organic layer was dried (anhydrous magnesium sulfate). The solvent was distilled off under reduced pressure. The residue was purified by means of a silica gel column chromatography to give (Z)-2-(4-chloro-5-fluoro-2-hydroxybenzoyl)-3-hydroxypyridine N-oxide O-t-butyloxime (0.79 g) (Compound 56).

Provenance & Evidence