A mixture of 4-Biphenylboronic acid (737 mg, 2.4 mmol), K2CO3 (995 mg, 7.2 mmol), Pd(PPh3)4 (139 mg, 0.12 mmol), compound 13-1 (700 mg, 2.4 mmol) in 10 mL toluene, 2 mL DMF, and 2 mL H2O was suspended in a microwave reactor vial and heated to 130° C. for 10 min in a microwave reactor. The resulting dark solution was then diluted with EtOAc (150 mL) and washed three times with 50 mL portions of saturated aqueous NH4Cl. The combined organic layers were dried over MgSO4 filtered and concentrated in vacuo. The crude product was purified on ISCO (EtOAc/Hexanes=6/4) to give title compound 13-2.
