反应详情

To a suspension of 3.90 g (17.50 mmol) of 4-(2-aminobenzoylamino)butanoic acid in 40 ml of dry ethyl acetate, add 3.26 g (17.56 mmol) of 2-nitrobenzoyl chloride dissolved in 5 ml of dry ethyl acetate and 1.76 g of triethylamine. Allow the reaction mixture to stir for 24 hours at room temperature. Eliminate the solvent at low pressure, add 30 ml of 10% NaOH to the crude product and continue stirring the mixture until the solid has completely disappeared. Immediately acidify with concentrated HCl and extract the product with ethyl acetate. Eliminate the solvent at low pressure and recombine the crude product with dry ether, obtaining a white solid. Purify the reaction product by recrystallization (EtOH/H2O). This yields 3.34 g (51%) of 4-[2-(2-nitrobenzoylamino)benzoylamino]butanoic acid as a white solid.

1. stirringcontinue stirring the mixture until the solid
2. extractionextract the product with ethyl acetate
3. customobtaining a white solid
4. customPurify the reaction product
5. customby recrystallization (EtOH/H2O)