Cesium carbonate → Methyl 2-{[3'-fluoro-4'-(formylamino)-1,1'-biphenyl-4-yl]carbonyl}cyclopentanecarboxylate

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To a suspension of 2-fluoro-4-iodophenylformamide (5.11 g, 19.28 mmol) bis(pinacolato)diboron (4.89 g, 19.28 mmol), potassium acetate (5.67 g, 57.84 mmol), and palladium acetate (129 mg, 0.58 mmol) in N,N-dimethylformamide (125 mL) was bubbled through argon for 30 minutes. The reaction mixture was then heated at 80° C. for 3 h. After the mixture was cooled to rt, methyl (R,R)-2-(4-bromobenzoyl)cyclopentanecarboxylate (2.2 g, 7.35 mmol, 97% ee), tetrakis(triphenylphosphine)palladium(0) (668 mg, 0.58 mmol), and cesium carbonate (9.43 g, 28.92 mmol) were added, and the reaction mixture was then heated at 80° C. for 16 h. The mixture was then cooled to rt, quenched with water, extracted with ethyl acetate, and dried over anhydrous sodium sulfate. Solvent was then removed under reduced pressure and the crude product was purified by flash chromatography (Biotage 75) using 1:1 ethylacetate/hexane to afford methyl 2-{[3′-fluoro-4′-(formylamino)-1,1′-biphenyl-4-yl]carbonyl}cyclopentanecarboxylate (4.6 g, 65%). LC-MS ret. time 3.15 min, m/z 342.0 (MH+); 1H NMR (300 MHz, DMSO-d6) δ 1.52–1.94 (m, 1H), 1.92–2.07 (m, 1H), 2.10–2.21 (m, 1H), 3.48 (m, 1H), 3.55 (s, 3H), 4.12 (q, 1H), 7.59 (dd, 1H), 7.62 (dd, 1H), 7.87 (d, 2H), 8.09 (d, 2H), 8.25 (t, 1H), 8.34 (s, 1H), 10.62 (s, 1H).

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