Diethylenetriamine → 3-[[[2-[(2-Aminoethyl)amino]ethyl]amino]acetylamino]-alpha-ethyl-2,4,6-triiodobenzenepropanoic acid

Beteiligte Stoffe

Reaktionsschritte

To 217 g of diethylenetriamine (product commercially available) (2.1 mol), under stirring and under nitrogen atmosphere, 259 g of compound (A) 3-[(2-chloroacetyl) amino]-α-ethyl-2,4,6-triiodobenzenepropanoic acid (0.40 mol) are added. The mixture is kept at 50° C. for 3 h and, after cooling, is extracted with three 500-ml portions of CH2Cl2. After evaporation of the solvent, the residue is dissolved in 500 ml of H2O and acidified with 300 ml of 37% HCl. The resulting solution is counterflow extracted according to Craig with n-BuOH. A residue is obtained, which is purified as trihydrochloride by crystallisation in abs. EtOH after addition of 37% HCl. 187 g of 3-[[[2-[(2-aminoethyl)amino]ethyl]amino]acetylamino]-α-ethyl-2,4,6-triiodobenzenepropanoic acid (0.227 mol) are obtained.

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