2-(6-bromo-1H-benzimidazol-2-yl)pyrrolidine-1-carboxylic acid tert-butyl ester → 2-[6-(5-{4-[2-(1-Formyl-pyrrolidin-2-yl)-3H-imidazol-4-yl]-phenyl}-thiophen-2-yl)-1H-benzoimidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-(5-{4-[5-(4,4,5,5-Tetramethyl-[1,3,2]dioxaborolan-2-yl)-thiophen-2-yl]-phenyl}-1H-imidazol-2-yl)-pyrrolidine-1-carboxylic acid tert-butyl ester (0.110 g), 2-(6-Bromo-1H-benzoimidazol-2-yl)-pyrrolidine-1-carboxylic acid tert-butyl ester (0.115 g) and Pd(PPh3)4 (0.012 g) in 2.0M potassium carbonate solution (0.32 mL) and dimethoxyethane (0.64 mL) was heated in microwave at 110° C. for 30 minutes. Reaction mixture was cooled, diluted with ethyl acetate, washed with brine, dried (MgSO4), concentrated and purified by flash column chromatography (silica gel, 50 to 100% ethyl acetate/hexanes) and preparative reverse phase HPLC (Gemini, 5 to 100% ACN/H2O+0.1% TFA) to give 2-[6-(5-{4-[2-(1-Formyl-pyrrolidin-2-yl)-3H-imidazol-4-yl]-phenyl}-thiophen-2-yl)-1H-benzoimidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl ester (0.085 g) as a bis-TFA salt: LCMS-ESI+: calc'd for C38H45N6O4S: 681.86 (M+H+). Found: 681.0 (M+H+). [1-(2-{6-[5-(4-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-phenyl)-thiophen-2-yl]-1H-benzoimidazol-2-yl}-pyrrolidine-1-carbonyl)-2-methyl-propyl]-carbamic acid methyl ester: A solution of 2-[6-(5-{4-[2-(1-Formyl-pyrrolidin-2-yl)-3H-imidazol-4-yl]-phenyl}-thiophen-2-yl)-1H-benzoimidazol-2-yl]-pyrrolidine-1-carboxylic acid tert-butyl ester (0.085 g) in dichloromethane (2.0 mL) was treated with 4N HCl in dioxane (2.0 mL) for 1.5 hour at ambient temperature. Reaction mixture was concentrated and dried under vacuum. The residue was dissolved in DMF (1.0 mL) and to this solution was added 2-Methoxycarbonylamino-3-methyl-butyric acid (0.033 g), 4-methylmorpholine (0.060 mL), followed by HATU (0.070 g). Reaction mixture was stirred for 45 minutes at ambient temperature and reaction mixture was diluted with ethyl acetate and washed with dilute sodium bicarbonate solution, 5% lithium chloride solution, brine and dried (MgSO4). Organic layer was concentrated and purified by preparative reverse phase HPLC (Gemini, 5 to 100% ACN/H2O+0.1% TFA). Product was lyophilized to give [1-(2-{6-[5-(4-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-phenyl)-thiophen-2-yl]-1H-benzoimidazol-2-yl}-pyrrolidine-1-carbonyl)-2-methyl-propyl]-carbamic acid methyl ester as the bis-TFA salt (0.048 mg): 1H-NMR: 300 MHz, (DMSO-d6) δ: 8.09 (br s, 1H), 7.90-7.75 (m, 8H), 7.70-7.55 (m, 4H), 7.34 (d, J=8.1, 2H), 5.25-5.10 (m, 2H), 4.20-4.15 (m, 4H), 4.15-3.85 (m, 4H), 3.54 (s, 6H), 2.50-1.85 (m, 10H), 0.87-0.75 (m, 12H): LCMS-ESI−: calc'd for C42H51N8O6S: 795.96 (M+H+). Found: 795.2 (M+H+).

Provenance & Evidence