Potassium Carbonate → 3-{5-[6-(4-{2-[5-(2-Methoxycarbonylamino-3-methyl-butyryl)-5-aza-spiro[2.4]hept-6-yl]-3H-imidazol-4-yl]-phenyl)-naphthalen-2-yl]-1H-imidazol-2-yl]-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of [2-Methyl-1-(6-{5-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-1H-imidazol-2-yl}-5-aza-spiro[2.4]heptane-5-carbonyl)-propyl]-carbamic acid methyl ester (0.95 g, 1.82 mmol) and 3-[5-(6-Bromo-naphthalen-2-yl)-1H-imidazol-2-yl]-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (0.96 g, 1.82 mmol, 1 equiv.) in DME (20 mL) was added K2CO3 (aqueous, 2 M, 3.6 mL, 7.2 mmol, 4 equiv.) and Pd(PPh3)4 (0.11 g, 0.09 mmol, 0.05 equiv.). The slurry was degassed with argon for 5 minutes and heated to 80° C. for 12 hours. The resulting reaction mixture was diluted with EtOAc and washed with water. The aqueous layer was back-extracted with EtOAc and the combined organic layers were dried over Na2SO4 and concentrated. The crude oil was purified by column chromatography (SiO2, 50→100% EtOAc in Hexanes) to provide 3-{5-[6-(4-{2-[5-(2-Methoxycarbonylamino-3-methyl-butyryl)-5-aza-spiro[2.4]hept-6-yl]-3H-imidazol-4-yl}-phenyl)-naphthalen-2-yl]-1H-imidazol-2-yl}-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (0.53 g, 37%) as a yellow powder.

Provenance & Evidence