A mixture of INT 57 (250 mg, 0.693 mmol), amine INT 38 (137 mg, 0.693 mmol) and cesium carbonate (678 mg, 2.079 mmol) in toluene (4.5 mL) and tert-butanol (1.8 mL) was purged with argon for 10 minutes. Then, XPhos (66.1 mg, 0.139 mmol) and palladium acetate (15.56 mg, 0.069 mmol) were added, the vial was closed and heated at 100° C. for 3 hours. The reaction mixture was then diluted with EtOAc (35 mL) and washed with water and brine. The organic layer was dried over sodium sulfate, filtered and concentrated.
