Acetic Acid → 2-(4-Bromo-2-fluorophenylamino)-6-oxo-1,6-dihydropyridine-3-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

Preparation of 2-(4-bromo-2-fluorophenylamino)-6-oxo-1,6-dihydropyridine-3-carboxylic acid methyl ester: To 2-(4-bromo-2-fluorophenylamino)-6-methoxy-nicotinic acid methyl ester (1.00 g, 2.82 mmol) in a sealed flask was added glacial acetic acid (10 mL) and HBr (10 mL, 48 wt % in H2O). The reaction mixture was stirred at 90-95° C. for 2 hours and then cooled to room temperature. The reaction mixture was diluted with EtOAc and washed with H2O, saturated NaHCO3, saturated NaCl, dried (Na2SO4) and concentrated under reduced pressure. The crude product was triturated twice with dichloromethane/methanol and the resulting solid was collected and dried under vacuum to yield 0.756 g (79%) pure desired product as a white solid.

Provenance & Evidence