L-Aspartic Acid → N-(3'-Dimethylaminopropyl)-aspartic acid-4-ethyl ester

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In a manner analogous to that of Example 1, 360.3 g (2.5 mols) of maleic acid monoethyl ester are placed into the glass flask and, with cooling, 500 ml of triethylamine are added dropwise. 306.5 g (2.5 mols+20% excess) of 3-dimethylaminopropylamine are subsequently added, and the reaction mixture is reacted at 64°-90° C. for 50 minutes. The crude product is processed according to Example 1, and the yield is 568.2 g (92.3% of theory) of a white crystalline aspartic acid derivative having a melting point of 168°-169° C.

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