Pyridine → 7-[(4'-Trifluoromethyl-biphenyl-2-carbonyl)-amino]-quinoline-3-carboxylic acid ethyl ester

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7-[Amino-quinoline-3-carboxylic acid ethyl ester (8.6 g, 39.8 mmol) was combined with pyridine (12.9 ml, 159 mmol) and 4-N,N-dimethylamino-pyridine (0.5 g, 4 mmol) in 100 ml of chloroform. The mixture was stirred as 4′-trifluoromethyl-biphenyl-2-carbonyl chloride (22.64 g, 79.5 mmol) was added as a solution in 100 ml of chloroform. After heating at reflux for 2 h, the mixture was concentrated under vacuum, the residue taken up in ethyl acetate (600 ml) and washed sequentially with a 1 N aqueous hydrochloric acid solution (2×200 ml), water, and brine. The organic phase was then dried over anhydrous magnesium sulfate, filtered and concentrated under vacuum to yield 29.4 g of a red oil. This oil was purified by chromatography on silica, eluting sequentially with a 70:30 dichloromethanelhexanes solution, followed by dichloromethane, then a 10:90 ethyl acetate/dichloromethane solution. Concentration under vacuum of the product containing fractions afforded 13.15 g of the title compound as a yellow solid.

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