A mixture of ethyl 2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)acetate (500 mg, 1.72 mmol), 5-bromo-1-methyl-1H-pyrazole (252 mg, 1.57 mmol), K2CO3 (651 mg, 4.71 mmol) and Pd(dppf)Cl2 (20 mg) in a solution of dioxane (10 mL) and H2O (2.5 mL) was stirred at 120° C. for 30 min under microwave. The catalyst was filtered through a pad of celite and the filtrate concentrated. The residue was purified by column chromatography to give the desired product (270 mg, Yield 70%) and used directly in the next step. LCMS (m/z): 245.1 (M+1).
