Hydrochloric Acid → 5-Bromo-2-(6-fluoropyridin-2-yloxy)benzoic acid

Participants

Reaction Conditions

Reaction Steps

A mixture of cesium carbonate (3.20 mL, 40.0 mmol), 5-bromosalicylic acid (4.34 g, 20.00 mmol) and 2,6-difluoropyridine (5.52 g, 48.0 mmol) in 8 mL of DMSO was stirred at 110° C. for 3 h. After cooling to rt, the reaction mixture was dissolved in water and the pH was adjusted to ˜3 with 1 N HCl. The reaction mixture was extracted with EtOAC (3×25 mL), washed with brine and evaporated to dryness to give crude 5-bromo-2-(6-fluoropyridin-2-yloxy)benzoic acid which was used directly in the next step.

Provenance & Evidence