3-Amino-1,2-propanediol → 5-Cyano-3-[N-(2,3-dihydroxypropyl)carbamoyl]-2,4,6-triiodobenzoyl chloride

Participants

Reaction Steps

18.1 g of 5-cyano-2,4,6-triiodoisophthalic acid dichloride is combined in 750 ml of dioxane at 80° C. with 7.1 g of 1-amino-2,3-propanediol and stirred for 2 hours. The mixture is then separated from the precipitated hydrochloride of 1-amino-2,3-propanediol, and the filtrate is concentrated under vacuum. The residue is extracted by boiling with 800 ml of ethyl acetate. After concentration and cooling, 11.7 g (59% of theory) of 5-cyano-3-[N-(2,3-dihydroxypropyl)carbamoyl]-2,4,6-triiodobenzoyl chloride is crystallized from the extract as a white powder; mp 285°-288° C.

Provenance & Evidence