4-Chlorobenzoic Acid → 2-(4-Chlorobenzoylamino)-3-(2-quinolon-3-yl)propionic acid

Beteiligte Stoffe

Reaktionsschritte

1.2 Grams of 2-amino-3-(2-quinolon-3-yl)propionic acid and 0.8 ml of triethylamine were suspended in 10 ml of tetrahydrofuran, then under stirring condition at a room temperature, a solution containing 1.0 g of diethyl chlorophosphate in 10 ml of tetrahydrofuran was added dropwise thereto, and the reaction mixture was stirred at a room temperature for 3 hours. To this reaction mixture was added a solution containing 1.0 g of p-chlorobenzoic acid in 10 ml of tetrahydrofuran dropwise and the whole reaction mixture was further stirred at a room temperature for 10 hours. After completion of the reaction, the crystals precipitated were removed by filtration, the filtrate was concentrated and to the residue was poured a saturated sodium hydrogencarbonate aqueous solution, then extracted with chloroform. The organic layer was washed with water and a saturated sodium chloride aqueous solution and dried with sodium sulfare. The solvent was removed by distillation and the residue was recrystallized from ethanol-water to obtain 0.9 g of 2-(4-chlorobenzoylamino)-3-(2-quinolon-3-yl)propionic acid in the form of white powder product.

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