Ethylamine → N,N'-diethyl-2-[({5-[4-(2-fluoro-5-{[(2-fluoro-5-methylphenyl)amino]carbonyl}phenoxy)pyridin-2-yl]-1H-pyrrol-3-yl}carbonyl)amino]pentanediamide

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To a stirred solution of 2-[({5-[4-(2-fluoro-5-{[(2-fluoro-5-methylphenyl)amino]carbonyl}phenoxy)pyridin-2-yl]-1H-pyrrol-3-yl}carbonyl)amino]pentanedioic acid (100 mg, 0.17 mmol) and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDC, 83 mg, 0.43 mmol) in 10 ml of anhydrous DMF was added 2M ethylamine solution in THF (0.43 ml, 0.86 mmol). The mixture was stirred at room temperature for overnight and poured into 100 ml of water. The precipitates were filtered, washed with water and dried in vacuo to give the crude, which was purified by silica gel chromatography eluting with 5-8% of methanol in chloroform to afford N,N′-diethyl-2-[({5-[4-(2-fluoro-5-{[(2-fluoro-5-methylphenyl)amino]carbonyl}phenoxy)pyridin-2-yl]-1H-pyrrol-3-yl}carbonyl)amino]pentanediamide as white solid. Yield: 76 mg, 69%.

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