A mixture of 4-(dihydroxyboryl)-2,3-difluorobenzoic acid (0.47 g, 2.3 mmol), 5-bromopyrimidin-2-amine (0.44 g, 2.6 mmol), tetrakis(triphenylphosphine)palladium (0.1 g, 0.1 mmol), and potassium carbonate (0.96 g, 7.0 mmol) in toluene (4.0 mL), ethanol (2.0 mL) and water (2.0 mL) was heated at 110° C. for 3 h. After cooling to RT, the mixture was washed with ether to remove impurity. The aqueous layer was adjusted to pH 6 with 1N HCl. The solid was filtered, washed with water and ether to give the desired product. LCMS: (M+H)=252.9.
