4-Chloropyridine-2-carboxamide → 4-(4-Amino-2,3-difluorophenoxy)pyridine-2-carboxamide

Participants

Reaction Steps

To a solution of 4-amino-2,3-difluorophenol (208 mg, 1.43 mmol) in DMF (4 mL) was added t-BuOK (257 mg, 2.29 mmol). The reaction was stirred at rt for 30 minutes, then 4-chloropicolinamide (249 mg, 1.59 mmol) was added. The mixture was microwaved at 120° C. for 3 hours, then cooled to rt and diluted with 25 mL of water. The resulted mixture was extracted with EtOAc (30 mL×3), and the combined organic phases were washed with brine (30 mL×3), dried over anhydrous Na2SO4, and concentrated in vacuo. The residue was purified by a silica gel column chromatography (PE/EtOAc (v/v)=1/2) to give the title compound as an orange solid (110 mg, 41.5%).

Provenance & Evidence