Potassium Carbonate → 2-(6-{4'-[2-(1-Boc-pyrrolidin-2-yl)-3-(2-trimethylsilanyl-ethoxymethyl)-3H-imidazol-4-yl]-biphenyl-4-yl}-1H-benzoimidazol-2-yl)-pyrrolidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-{6-[4′-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-biphenyl-4-yl]-1H-benzoimidazol-2-yl}-pyrrolidine-1-carboxylic acid tert-butyl ester (147 mg, 0.26 mmol), 2-[5-bromo-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl ester (116 mg, 0.26 mmol), tetrakis(triphenylphosphine)palladium (30 mg, 0.026 mmol), Pd(dppf)Cl2 (21 mg, 0.026 mmol) and potassium carbonate (72 mg, 0.52 mmol) in 3 ml 1,2-dimethoxyethane and 1 mL water was heated to 90° C. for 2.5 hours. The reaction mixture was cooled and dissolved in ethyl acetate and washed with 5% lithium chloride aqueous solution. The organic layer was dried (MgSO4), concentrated and purified by preparative reverse phase HPLC (GEMINI, 5 to 100% ACN/H2O+0.1% TFA). Product was lyophilized to give 2-(6-{4′-[2-(1-Boc-pyrrolidin-2-yl)-3-(2-trimethylsilanyl-ethoxymethyl)-3H-imidazol-4-yl]-biphenyl-4-yl}-1H-benzoimidazol-2-yl)-pyrrolidine-1-carboxylic acid tert-butyl ester (52 mg, yield 25%); LCMS-ESI+: calc'd for C46H60N6O5Si: 805.09. Found: 805.1 (M+H+).

Provenance & Evidence