7-[(4′-Trifluoromethyl-biphenyl-2-carbonyl)-amino]-quinoline-3-carboxylic acid (100 mg, 0.23 mmol) was combined with 1-phenylpropylamine (31 mg, 0.23 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (53 mg, 0.27 mmol), 1-hydroxybenzotriazole (34 mg, 0.25 mmol), and triethylamine (0.13 ml, 0.92 mmol) in 1.5 ml of dichloromethane. After stirring overnight at ambient temperature, the reaction mixture was concentrated under vacuum, the residue was suspended in water, and the solid was collected by vacuum filtration. This material was purified by preparative thin-layer-chromatography on silica eluting with a 3:1 ethyl acetate-hexanes mixture. The product containing band was collected and eluted with 5% methanol in ethyl acetate to afford 66 mg of the title compound as a colorless solid.
