1,2-Dimethoxyethane → 2-(5-{4'-[3-(2-Trimethylsilanyl-ethoxymethyl)-3H-imidazol-4-yl]-biphenyl-4-yl}-1H-imidazol-2-yl)-pyrrolidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of 1:1 mixture of 5-(4-Bromo-phenyl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazole and 4-(4-Bromo-phenyl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazole (0.145 g), 2-{5-[4-(4,4,5,5-Tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-1H-imidazol-2-yl}-pyrrolidine-1-carboxylic acid tert-butyl ester (0.150 g, prepared according to WO2008021927 A2) and Pd(PPh3)4 (0.020 g) in aq. K2CO3 solution (0.51 mL)/dimethoxyethane (1.5 mL) was heated at 80° C. for 18 hours. Reaction mixture was cooled, diluted with ethyl acetate, washed with brine, dried (MgSO4) and concentrated. The residue was purified by flash column chromatography (silica gel, 50 to 100% ethyl acetate/hexanes) to give a 1:1 mixture 2-(5-{4′-[3-(2-Trimethylsilanyl-ethoxymethyl)-3H-imidazol-4-yl]-biphenyl-4-yl}-1H-imidazol-2-yl)-pyrrolidine-1-carboxylic acid tert-butyl ester and 2-(5-{4′-[1-(2-Trimethylsilanyl-ethoxymethyl)-1H-imidazol-4-yl]-biphenyl-4-yl}-1H-imidazol-2-yl)-pyrrolidine-1-carboxylic acid tert-butyl ester (0.0998 g): LCMS-ESI+: calc'd for C33H44N5O3Si: 586.82 (M+H+). Found: 586.0 (M+H+).

Provenance & Evidence