Oxalyl chloride → N-(2,6-Difluoro-3-hydroxy-phenyl)-3-(3-fluorophenyl)benzamide

Participants

Reaction Steps

To a stirred solution of 3-(3-fluorophenyl)benzoic acid (430 mg, 1.99 mmol, 1.1 eq), in CH2Cl2 (10 mL) and DMF (0.15 mL) at 0° C. was added (COCl)2 (760 mg, 5.97 mmol, 3.3 eq) dropwise. The reaction was stirred for 2 h, then the solvent removed. The residue dissolved in THF (6 mL) and added to a mixture of 3-amino-2,4-difluoro-phenol (intermediate X(a)) (262.5 mg, 1.81 mmol, 1.0 eq) and NaHCO3 (760 mg, 9.05 mmol, 5 eq) in THF (6 mL) at 0° C. The reaction was stirred for 3 h then quenched by addition of water. The aqueous layer was extracted with EtOAc and the combined organic extracts were washed with Na2CO3, water and brine, dried (Na2SO4), filtered and evaporated in vacuo. The crude residue was crystallised from petroleum ether:EtOAc 3:1 to give the title compound (310 mg, 50%). Evaporation of the filtrate provided a further 180 mg of impure material.

Provenance & Evidence