Trifluoroacetic anhydride → 5-Bromo-2-carboxypyridine 1-oxide

Participants

Reaction Steps

To a suspension of 5-bromopicolinic acid (25.0 g) and urea-hydrogen peroxide adduct (20.0 g) in acetonitrile (200 mL) was added trifluoroacetic anhydride (50 mL) at 0° C., and the mixture was stirred for 30 min. The reaction mixture was filtered, and the filtrate was concentrated under reduced pressure. The obtained residue was recrystallized from diethyl ether to give the title compound (19.6 g) as white crystals.

Provenance & Evidence