Potassium Carbonate → N-{3-[2-(2,4-Dichloro-benzoyl)-3-trifluoromethyl-benzofuran-6-yl]-phenyl}-acetamide

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To a solution of trifluoro-methanesulfo4nic acid 2-(2,4-dichloro-benzoyl)-3-trifluoromethyl-benzofuran-6-yl ester from step 2 (110 mg, 0.217 mmol) in anhydrous N,N-dimethylformamide (2 mL) were added 3-acetamidobenzene boronic acid (58.2 mg, 0.325 mmol, 1.5 eq), potassium carbonate (60.0 mg, 0.434 mmol, 2 eq) and tetrakis(triphenylphosphine)palladium(0) (50 mg, 0.043 mmol, 0.2 eq) under argon. The resulting reaction mixture was degassed for 5 min. and then the reaction was then stirred at 80° C. for 6 h. The mixture was cooled to room temperature then poured into ethyl acetate (10 mL) and water (10 mL). The aqueous layer was extracted with ethyl acetate (2×10 mL), and the combined organic layers were washed with water (2×10 mL), dried over Na2SO4, filtrated, and evaporated in vacuo. The residue was purified by pre-HPLC to afford an yellow solid (19.5 mg, 18.3%) as product. 1H-NMR (DMSO-d6): 10.08 (s, 1H), 8.10 to 7.99 (m, 3H), 7.91 (d, J=2.0 Hz, 1H), 7.88 (d, J=8.5 Hz, 1H), 7.81 (dd, J=8.5, 1.7 Hz, 1H), 7.70 (dd, J=8.4, 2.3 Hz, 1H), 7.59 (dt, J=7.6, 2.0 Hz, 1H), 7.47 to 7.37 (m, 2H), 2.06 (s, 3H); LC-MS (MH+=492/494).

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