Hydrochloric Acid → (1-{2-[5-(7-{2-[2-(2-Methoxycarbonylamino-3-methyl-butyryl)-2-aza-bicyclo[2.2.1]hept-3-yl]-3H-benzoimidazol-5-yl}-dibenzothiophen-3-yl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester

Participants

Reaction Steps

4N HCl in dioxane (3 mL) was added to 3-(6-{7-[2-(1-tert-Butoxycarbonyl-pyrrolidin-2-yl)-3H-imidazol-4-yl]-dibenzothiophen-3-yl}-1H-benzoimidazol-2-yl)-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (141 mg, 0.194 mmol) in 3 mL DCM. The reaction mixture was stirred at room temperature for 1 hour. The reaction mixture was concentrated and dried overnight under vacuum. The residue was dissolved in DMF (4 mL) and to this solution was added 2-Methoxycarbonylamino-3-methyl-butyric acid (2.08 eq., 71 mg), 4-methylmorpholine (6 eq., 0.12 mL), followed by HATU (2.04 eq., 150 mg). Reaction mixture was stirred at 0° C. for 30 minutes. The reaction mixture was diluted 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, 0 to 20% MeOH/ethyl acetate), followed by preparative reverse phase HPLC (GEMINI, 5 to 100% ACN/H2O+0.1% TFA). Product was lyophilized to give (1-{2-[5-(7-{2-[2-(2-Methoxycarbonylamino-3-methyl-butyryl)-2-aza-bicyclo[2.2.1]hept-3-yl]-3H-benzoimidazol-5-yl}-dibenzothiophen-3-yl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (Example DE) (121 mg, 59%).

Provenance & Evidence