Ethyl 4-chlorobenzoate → 2-(4-Chlorobenzoylamino)-3-(2-quinolon-3-yl)propionic acid

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In 100 ml of ethanol, 1.66 g of ethyl p-chlorobenzate, 0.5 g of sodium ethylate and 2.09 g of 2-amino-3-(2-quinolon-3-yl)propionic acid were added and the whole mixture was placed in an autoclave. The reaction was carried out under 110 atmospheric pressure at 140°-150° C. for 6 hours. After completion of the reaction, the reaction mixture was cooled and concentrated under a reduced pressure. The residue was dissolved in 200 ml of chloroform, washed with 1%-potassium carbonate aqueous solution, a diluted hydrochloric acid and water in this order, then the chloroform layer was dried with sodium sulfate. The solvent was removed by distillation, the residue was recrystallized from ethanol-water to obtain 300 mg of 2-(4-chlorobenzoylamino)-3-(2-quinolon-3-yl)propionic acid in the form of white powdery product.

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