Sodium hydride → 3'-(2-methoxycarbonylamino-3-methyl-butyryl)-4-[4-(4-{2-[1-(2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazol-4-yl}-phenylethynyl)-phenyl]-1-(2-trimethylsilanyl-ethoxymethyl)-2',3',4',5'-tetrahydro-1H-[2,4']biimidazolyl-1'-carboxylic acid tert-butyl ester

Participants

Reaction Steps

Sodium hydride (60% in mineral oil, 27 mg, 0.55 mmol) was added to a solution of 3′-(2-methoxycarbonylamino-3-methyl-butyryl)-4-[4-(4-{2-[1-(2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-1H-imidazol-4-yl}-phenylethynyl)-phenyl]-2′,3′,4′,5′-tetrahydro-1H-[2,4′]biimidazolyl-1′-carboxylic acid tert-butyl ester (248 mg, 0.23 mmol) in dimethylformamide (8 mL) under an atmosphere of nitrogen at 0° C. After 15 minutes 2-(trimethylsilyl)ethoxymethyl chloride (107.5 μL, 0.48 mmol) was added and the reaction was allowed to warm to ambient temperature. After 2 hours the solvent was removed under reduced pressure. The residue was taken up in dichloromethane (50 mL) washed with water (20 mL), and dried over sodium sulfate and filtered. The solvent was removed under reduced pressure. The residue was subjected to flash chromatography with eluent of (10% methanol in ethyl acetate) and hexane. The product-containing fractions were combined and the solvent was removed under reduced pressure to yield 3′-(2-methoxycarbonylamino-3-methyl-butyryl)-4-[4-(4-{2-[1-(2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazol-4-yl}-phenylethynyl)-phenyl]-1-(2-trimethylsilanyl-ethoxymethyl)-2′,3′,4′,5′-tetrahydro-1H-[2,4]biimidazolyl-1′-carboxylic acid tert-butyl ester (410 mg, 0.36 mmol). C58H85N9O10Si2 calculated 1123.6 observed [M+1]+ 1124.7; rt=3.10 min. 3′-(2-Methoxycarbonylamino-3-methyl-butyryl)-4-[4-(4-{2-[1-(2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazol-4-yl}-phenylethynyl)-phenyl]-1-(2-trimethylsilanyl-ethoxymethyl)-2′,3′,4′,5′-tetrahydro-1H-[2,4′]biimidazole: 3′-(2-Methoxycarbonylamino-3-methyl-butyryl)-4-[4-(4-{2-[1-(2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazol-4-yl}-phenylethynyl)-phenyl]-1-(2-trimethylsilanyl-ethoxymethyl)-2′,3′,4′,5′-tetrahydro-1H-[2,4′]biimidazole was prepared using method 804 substituting 3′-(2-methoxycarbonylamino-3-methyl-butyryl)-4-[4-(4-{2-[1-(2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazol-4-yl}-phenylethynyl)-phenyl]-1-(2-trimethylsilanyl-ethoxymethyl)-2′,3′,4′,5′-tetrahydro-1H-[2,4]biimidazolyl-1′-carboxylic acid tert-butyl ester for {1-[5-(4′-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-biphenyl-4-yl)-1H-imidazol-2-ylmethyl]-2-oxo-piperidin-3-yl}-carbamic acid tert-butyl ester. C1-53H77N9O8Si2 calculated 1023.5 observed [M+1]+ 1024.7; rt=2.81 min. The Following Step Constitutes an Example of Method 808. 3′-(2-Methoxycarbonylamino-3-methyl-butyryl)-4-[4-(4-{2-[1-(2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-1H-imidazol-4-yl}-phenylethynyl)-phenyl]-2′,3′,4′,5′-tetrahydro-1H-[2,4′]biimidazolyl-1′-carboxylic acid methyl ester: Methyl chloroformate (15 μL, 0.19 mmol) was added to a solution of 3′-(2-methoxycarbonylamino-3-methyl-butyryl)-4-[4-(4-{2-[1-(2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazol-4-yl]-phenylethynyl)-phenyl}-1-(2-trimethylsilanyl-ethoxymethyl)-2′,3′,4′,5′-tetrahydro-1H-[2,4′]biimidazole (97 mg, 0.09 mmol), and 4-methylmorpholine (40 μL, 0.36 mmol) in dichloromethane (3 mL). After 30 minutes the solvent was removed under reduced pressure and azeotroped with toluene. The residue was taken up in dichloromethane (5 mL) and trifluoroacetic acid (5 mL) was added. After 16 hours the volatiles were removed under reduced pressure and the residue was taken up in tetrahydrofuran (4 mL) and methanol (2 mL). An aqueous solution of sodium hydroxide (2 N, 1 mL) was added. After 30 min the organic solvents were removed under reduced pressure and the resulting precipitate was isolated by filtration. The solid was taken up in dimethylformamide (2 mL) and subjected to reverse phase chromatography with an eluent of 0.1% TFA in water and 0.1% TFA in acetonitrile. The product-containing fractions were combined and the solvent was removed by lyophilization to provide 3′-(2-methoxycarbonylamino-3-methyl-butyryl)-4-[4-(4-{2-[1-(2-methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-1H-imidazol-4-yl}-phenylethynyl)-phenyl]-2′,3′,4′,5′-tetrahydro-1H-[2,4]biimidazolyl-1′-carboxylic acid methyl ester (14.1 mg, 0.017 mmol, 10%).

Provenance & Evidence