To a solution of 1-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (1.35 g, 6.5 mmol) in dioxane/H2O (5:1, 59 mL) was added K2CO3 (2.8 g, 20.3 mmol), tetrakistriphenylphosphine Pd(0) (340 mg, 0.3 mmol), and 5-bromo-2-pyrimidinecarboxylic acid (1.2 g, 5.9 mmol). The reaction mixture was heated to 80° C. in a sealed tube for 12 h. The reaction solution was poured onto H2O (100 mL) and extracted with DCM. The organics were dried (Na2SO4), concentrated under vacuum to give the title compound (0.9 g, 36%) as a tan solid: LC-MS (ES) m/z=437 (M+H)+.
