Tetrabutylammonium Fluoride → HCID 53372243、化合物

To a solution of benzyl 3-{[5-(biphenyl-4-yl)-6-chloro-1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-benzimidazol-2-yl]oxy}cyclohexanecarboxylate (isomer A from Step A, 0.075 g, 0.112 mmol) in 1.1 mL of THF was added TBAF (0.675 mL, 0.675 mmol) dropwise via syringe. The reaction was heated at 80° C. for 16 h, and then diluted with EtOAc (50 mL) and washed with 2 N HCl (2×20 mL). The organic layer was washed with H2O and brine, dried over Na2SO4, filtered, and concentrated. Purification of the resulting residue by reverse phase Gilson™ HPLC (30-100% MeCN/H2O) afforded the title compound as a white solid. LCMS: calculated for C26H23ClN2O3 446.93, observed m/e 446.92M+ (Rt 2.19/4 min). 1H NMR (500 MHz, CD3OD): δ7.71-7.64 (m, 4H), 7.55 (brs, 1H), 7.50 (d, 2H), 7.48-7.43 (m, 2H), 7.39 (brs, 1H), 7.37-7.32 (m, 1H), 5.00-4.91 (m, 1H), 2.60-2.46 (m, 2H), 2.33-2.24 (m, 1H), 2.06-1.95 (m, 2H), 1.79-1.67 (m, 1H), 1.64-1.49 (m, 2H), 1.49-1.37 (m, 1H).