N,N-Dimethyl-1,3-propanediamine → N-(3'-Dimethylaminopropyl)-aspartic acid-4-n-butyl ester

Participants

Reaction Steps

In the apparatus described in Example 1, 500 ml of triethylamine are added with cooling, within 2 hours and 35 minutes, at 4°-10° C. internal temperature to 430.5 g (2.5 mols) of maleic acid-mono-n-butyl ester. There are subsequently quickly added 306.5 g (2.5 mols+20% excess) of 3-dimethylaminopropylamine, and the mixture is reacted for 30 minutes at 90°-95° C. The reaction product is processed in a manner analogous to that described in Example 1 to obtain a yield of 595 g (86.8% of theory) of a crystalline aspartic acid derivative, which melts at 154°-157.5° C.

Provenance & Evidence