3-Bromo-4-trifluoromethyl-benzoic acid (0.484 g, 1.80 mmol), 3-chloro-4-methoxy-phenylboronic acid (0.503 g, 2.70 mmol), tri-tert-butylphosphonium tetrafluoroborate (0.313 g, 1.08 mmol), tris(dibenzylideneacetone)dipalladium(0) (0.494 g, 0.54 mmol) and potassium fluoride (0.345 g, 5.93 mmol) were weighed into a flask and dioxane (10 ml) was added under argon, and the mixture was stirred for 24 h at 50° C. The mixture was filtered over celite and evaporated to dryness. The residue was purified by preparative RP HPLC (water/ACN gradient) to yield the title compound.
