Sodium carbonate (0.636 g, 6.0 mmol) in water (2.0 mL) was added to a mixture of 5-bromopyrimidin-2-amine (0.348 g, 2.0 mmol), [4-(tert-butoxycarbonyl)phenyl]boronic acid (0.533 g, 2.4 mmol) and tetrakis(triphenylphosphine)palladium (69 mg, 0.06 mmol) in ethanol (3 mL) and toluene (3 mL). The mixture was heated at 120° C. for 3 h. After cooling to RT, the mixture was diluted with EtOAc and washed with water and brine. The organic layer was dried over Na2SO4, filtered and concentrated under reduced pressure to afford the desired product (470 mg, 86.6%) which was directly used in next step. LCMS: (M+H)=272.1.
