Water → 6-Chloro-4-(4-fluorophenyl)-2-methyl-3-quinolinecarboxylic acid, ethyl ester

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Reaction Steps

To a solution of (2-amino-5-chlorophenyl)-(4-fluorophenyl)methanone (10.0 g) in 100 mL of toluene was added 8.3g (1.6 equivalents) of ethyl acetoacetate and 0.30 g of p-toluenesulfonic acid. The resulting mixture was heated to reflux with azeotropic removal of water. After one and one-half hours, the mixture was cooled to room temperature and concentrated under vacuum. The crude product was purified by flash chromatography over silica gel to give 10.18 g of 6-chloro-4-(4-fluorophenyl)-2-methyl-3-quinolinecarboxylic acid, ethyl ester as an off-white solid.

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