Potassium Carbonate → 3-(6-{4'-[2-(5-tert-Butoxycarbonyl-5-aza-spiro[2.4]hept-6-yl)-3H-imidazol-4-yl]-biphenyl-4-yl}-1H-benzoimidazol-2-yl)-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of 6-[5-(4-Bromo-phenyl)-1H-imidazol-2-yl]-5-aza-spiro[2.4]heptane-5-carboxylic acid tert-butyl ester (101 mg, 0.243 mmol, 1 eq.), 3-{6-[4-(4,4,5,5-Tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-1H-benzoimidazol-2-yl}-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (150 mg, 0.291 mmol, 1.2 eq.), tetrakis(triphenylphosphine)palladium (5%, 17 mg) and 2M potassium carbonate aqueous solution (5 eq., 0.73 mL) in 1.5 mL DME was heated to 90° C. under Are overnight. The reaction mixture was cooled and dissolved in ethyl acetate and washed with saturated sodium bicarbonate solution. The organic layer was dried (MgSO4), concentrated and purified by flash column chromatography (silica gel, 50 to 100% ethyl acetate/hexane) to give 3-(6-{4′-[2-(5-tert-Butoxycarbonyl-5-aza-spiro[2.4]hept-6-yl)-3H-imidazol-4-yl]-biphenyl-4-yl}-1H-benzoimidazol-2-yl)-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (53 mg, yield 26%). LCMS-ESI−: calc'd for C44H50N6O4: 726.91. Found: 727.2 (M+H+).

Provenance & Evidence