Potassium Carbonate → Ethyl 4-{[5-(biphenyl-4-yl)-1-(biphenyl-4-ylmethyl)-4,6-difluoro-1H-benzimidazol-2-yl]oxy}cyclohexanecarboxylate

Participants

Reaction Conditions

Reaction Steps

A 250 mL flask was charged with ethyl 4-{[1-(biphenyl-4-ylmethyl)-4,6-difluoro-5-iodo-1H-benzimidazol-2-yl]oxy}cyclohexane carboxylate (2 g, 3.24 mmol), 4-Biphenylboronic acid (0.700 g, 3.53 mmol), Pd(PPh3)4 (0.185 g, 0.160 mmol), DMF (30 mL), and 1 M aqueous K2CO3 (6.5 ml, 6.50 mmol). The reaction was degassed with N2 and then heated at 120° C. for 1 hour. The volatiles were removed in vacuo and the resulting residue was partitioned between EtOAc and H2O. The aqueous phase was extracted with EtOAc. The combined organic layers were washed with brine, dried (MgSO4), filtered, and concentrated. Chromatography of the resulting residue over silica eluting with 15% [EtOAc:DCM (1:1)]/hexanes afforded the desired trans product as white solid. LC-MS: calculated for C41H36F2N2O3 642.27, observed m/e: 643.14 (M+H)+ (Rt 3.07/4 min).

Provenance & Evidence