A microwave tube was charged with 3-bromo-6-(methylthio)-1H-pyrazolo[3,4-d]pyrimidine (1.0 g, 4.0 mmol), phenylboronic acid (1.5 g, 12 mmol), potassium phosphonate (2.5 g, 12 mmol), tetrakis(triphenylphosphine)palladium (0.35 g, 0.30 mmol), dioxane (16 mL) and water (4 mL). The mixture was heated in microwave at 150° C. for 20 min. The reaction mixture was poured into water. The aqueous layer was extracted with EtOAc (10×). The combined organic layer was dried (Na2SO4), concentrated, and purified to provide 6-(methylthio)-3-phenyl-1H-pyrazolo[3,4-d]pyrimidine (0.85 g, 87%) as a white solid. MS m/z 243.1 [M+H]+.
