Hydrochloric Acid → 10-[2-[(3-Carboxy-2,4,6-triiodophenyl)amino]-2-oxoethyl]-1,4,7,10-tetraazacyclododecane-1,4,7-triacetic acid

Beteiligte Stoffe

Reaktionsschritte

18.9 g of bromoacetic acid (product available on the market) (0.136 mol) are dissolved in 20 ml of H2O, and by keeping the temperature below 10° C., the solution pH is adjusted to 5 with 68 ml of 2N NaOH (0.136 mol). After adding a solution of 30 g of compound. (B) N-(3-carboxy-2,4,6-triiodophenyl)-1,4,7,10-tetraazacyclododecane-1-acetamide (0.041 mol) in 20.5 ml of 2N NaOH, the reaction mixture is heated at 50° C. for 15 h keeping the pH at 10 with 6.15 ml of 2N NaOH (0.123 mol). A solid precipitates which is then filtered and dissolved in 200 ml of H2O. After acidification of the solution with 82 ml of HCl 2N (0.164 mol) the precipitate is filtered. 28.2 g of 10-[2-[(3-carboxy-2,4,6-triiodophenyl)amino]-2-oxoethyl]-1,4,7,10-tetraazacyclododecane-1,4,7-triacetic acid (0.029 mol) are obtained.

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