1,2-Dimethoxyethane → 2-{5-[4-(2-Benzyloxy-pyridin-4-yl)-phenyl]-1H-imidazol-2-yl}-pyrrolidine-1-carboxylic acid tert-butyl ester

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A mixture of 2-Benzyloxy-4-bromo-pyridine (0.292 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 (0.533 g, prepared according to WO2008021927 A2) and Pd(PPh3)4 (0.064 g) in aq. K2CO3 solution/dimethoxyethane (1.82 mL/5.0 mL) was heated at 80-90° C. for 8 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, 20 to 80% ethyl acetate/hexanes) to give 2-{5-[4-(2-Benzyloxy-pyridin-4-yl)-phenyl]-1H-imidazol-2-yl}-pyrrolidine-1-carboxylic acid tert-butyl ester (0.530 g): LCMS-ESI+: calc'd for C30H33N4O3: 497.6 (M+H+). Found: 497.0 (M+H+).

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