A mixture of Example 14B (150 mg, 0.384 mmol), 4-bromopyridine hydrochloride (75 mg, 0.34 mmol), Pd2Cl2(PPh3)2 (27 mg, 0.0384 mmol), and CuI (18 mg, 0.093 mmol), was purged with nitrogen, treated with DMF (4 mL) and triethylamine (214 μL, 1.54 mmol), stirred at 50° C. for 20 hours, cooled to room temperature, treated with ethyl acetate (50 mL), washed with brine, dried (MgSO4), filtered, and concentrated. The residual oil was purified by flash column chromatography on silica gel with 2:1 ethyl acetate/hexanes to provide the desired product (122 mg, 68%). MS (APCI) m/e 469 (M+H)+.
