Triethylamine → HCID 178502199, compound

Participants

Reaction Conditions

Reaction Steps

3-[4-(4-Bromo-phenyl)-1H-imidazol-2-yl]-4-(2-methoxycarbonylamino-3-methyl-butyryl)-piperazine-1-carboxylic acid tert-butyl ester (600 mg, 1.06 mmol) was combined with (1-{2-[5-(4-Ethynyl-phenyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (503 mg, 1.27 mmol) and Pd(PPh3)4 (122 mg, 0.106 mmol) under an argon atmosphere. DMF (degassed with Argon) was added followed by triethylamine (1.47 mL, 10.6 mmol) and copper(I) iodide (20.0 mg, 0.106 mmol). The mixture was heated at 80° C. After 20 minutes, volatiles were removed in vacuo and the crude material was semi-purified via chromatography on silica gel (eluent: EtOAc w MeOH 10%/hexanes) to yield the product 4-(2-Methoxycarbonylamino-3-methyl-butyryl)-3-{4-[4-(4-{2-[1-(2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-phenylethynyl)-phenyl]-1H-imidazol-2-yl}-piperazine-1-carboxylic acid tert-butyl ester (542 mg). LCMS-ESI+: calc'd for C47H59N9O8: 878.0 (M+). Found: 878.5 (M+H+). SEM protected imidazole intermediate: 4-(2-Methoxycarbonylamino-3-methyl-butyryl)-3-{4-[4-(4-{2-[1-(2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-phenylethynyl)-phenyl]-1H-imidazol-2-yl}-piperazine-1-carboxylic acid tert-butyl ester (512 mg, 0.586 mmol) was dissolved in DMF (10 mL). Sodium hydride (60% in mineral oil, 56 mg) was added at 0° C., followed by SEM-Cl (0.217 mL). After two hours, the solvents were removed in vacuo and the crude material was partitioned between DCM and water. The organic layer was dried and the crude material was purified by flash chromatography in silica gel to yield 591 mg of the SEM protected imidazole product.

Provenance & Evidence