Nitrogen → 3-{5-[4-(4-[2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-phenylethynyl)-phenyl]-1H-imidazol-2-yl}-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

A solution of (1-{2-[5-(4-Ethynyl-phenyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (500 mg, 1.27 mmol), 3-[5-(4-Bromo-phenyl)-1H-imidazol-2-yl]-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (530 mg, 1.27 mmol), and triethylamine (531 □L, 3.81 mmol) in DMF (6.4 mL) was degassed with N2 gas for 20 minutes. To the degassed solution was added Pd(PPh3)4 (150 mg, 0.13 mmol) and CuI (25 mg, 0.13 mmol). The pressure flask was sealed then heated at 80° C. overnight. After cooling to room temperature, the reaction was quenched with AcOH then purified by reverse phase preparative HPLC (10-70% MeCN—H2O; 0.1% formic acid modifier) then silica gel chromatography (0-10% MeOH-EtOAc gradient) to afford 3-{5-[4-(4-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-phenylethynyl)-phenyl]-1H-imidazol-2-yl}-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (500 mg, 0.68 mmol, 54% yield). LCMS-ESI+: calc'd for C42H50N7O5: 732.4 (M+H+). Found: 732.2 (M+H+). [1-(3-{5-[4-(4-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-phenylethynyl)-phenyl]-1H-imidazol-2-yl}-2-aza-bicyclo[2.2.1]heptane-2-carbonyl)-2-methyl-propyl]-carbamic acid methyl ester: To 3-{5-[4-(4-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-phenylethynyl)-phenyl]-1H-imidazol-2-yl}-2-aza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (150 mg, 0.20 mmol) in dioxanes (2 mL) was added 4N HCl in dioxanes (250 □L). The suspension was stirred for 2 hours then concentrated to afford the HCl salt of the crude amine. To the crude amine in DMF (4 mL) was added N-methylmorpholine (330 □L, 0.30 mmol). After all material dissolved, 2-methoxycarbonylamino-3-methyl-butyric acid (53 mg, 0.30 mmol) and HATU (76 mg, 0.20 mmol) were added. After stirring for overnight the reaction was quenched with AcOH then purified by reverse phase preparative HPLC (5-45% MeCN—H2O; 0.1% formic acid modifier) to afford the title product [1-(3-{5-[4-(4-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-phenylethynyl)-phenyl]-1H-imidazol-2-yl}-2-aza-bicyclo[2.2.1]heptane-2-carbonyl)-2-methyl-propyl]-carbamic acid methyl ester (83 mg, 0.11 mmol, 53% yield). 1H-NMR: 400 MHz, (DMSO-d6) δ: 7.59-7.55 (m, 4H), 7.41-7.38 (m, 4H), 7.17 (s, 1H), 7.15 (s, 1H), 6.16 (m, 2H), 5.15 (m, 1H), 4.63 (s, 1H), 4.50 (s, 1H), 4.34-4.24 (m, 2H), 3.88-3.72 (m, 2H), 3.63 (s, 3H), 3.61 (s, 3H), 2.88 (m, 1H), 2.25-2.15 (m, 1H), 2.27-2.16 (m, 2H), 2.05-1.80 (m, 5H), 1.54 (d, 2H), 1.00-0.887 (m, 12H). LCMS-ESI+: calc'd for C44H53N8O6: 789.4 (M+H+). Found: 789.5 (M+H+).

Provenance & Evidence