Novel non-ionic contrast media of a hitherto unknown combination of low osmolality and low viscosity are efficiently prepared from generally available ionic contrast media or non-iodinated precursors. Particularly, polyhydroxyhalo-hydrocarbons are employed with a triiodo-substituted acylamido benzoic acids in aqueous weakly basic media to selectively substitute the amido nitrogen, followed by activation of the carboxyl group for amide formation.
一种迄今为止未知的低渗透压和低粘度的新型非离子造影剂,可以有效地从一般可获得的离子性造影剂或非
碘化前体制备而成。特别地,聚羟基卤代烃类与三
碘代酰胺基
苯甲酸在
水性弱碱性介质中被用来选择性地替代酰胺氮原子,随后激活羧基以形成酰胺。