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

Beteiligte Stoffe

Reaktionsschritte

286 g (2.0 mols+10% excess) of maleic acid-monomethyl ester are placed into a glass flask fitted with a blade stirrer, thermometer, reflux condenser and dropping funnel, and, with ice-water cooling, 400 ml of triethylamine are added dropwise at 6°-11° C. internal temperature within 1 hour and 35 minutes. The cooling is subsequently removed, 204 g (2.0 mols) of 3-dimethylaminopropylamine are quickly added, and the mixture is reacted for 10 minutes at 87°-90° C. and is then cooled to room temperature; the crystalline crude product is mixed with 1 liter of acetone, the suspension is filtered, and the filter residue is washed with acetone. The yield after drying at 80° C. in vacuo is 296 g (63.7% of theory) of a crystalline aspartic acid derivative, which melts at 171°-172° C.

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