Acetylation using reduced volume of acetic acid anhydride for synthesizing non-ionic X-ray contrast agents
申请人:GE Healthcare AS
公开号:EP2277851A1
公开(公告)日:2011-01-26
This invention relates to an improved method for the synthesis of 5-acetamido-N,N'-bis(2,3-dihydroxypropyl)-2,4,6-triiodoisophthalamide ("Compound A"), an intermediate in the industrial preparation of non-ionic X-ray contrast agents. In particular, it relates to acetylation of 5-amino-N, N'-bis(2,3-dihydroxypropyl)-2,4,6-triiodo-1,3-benzenedicarboxamide ("Compound B") using a reagent and solvent mixture containing between about 1.5 and about 3.0 liter of acetic anhydride and acetic acid per kilogram of Compound B. Preferably, following the acetylation reaction, the reagent and solvent mixture is distilled for re-use.
本发明涉及一种改进的合成5-乙酰氨基-N,N'-双(2,3-二羟丙基)-2,4,6-三碘异酞酰胺("化合物A")的方法,该化合物是工业制备非离子型X射线造影剂的中间体。具体而言,本发明涉及使用含有约1.5至约3.0升乙酸酐和乙酸每千克化合物B的试剂和溶剂混合物,对5-氨基-N,N'-双(2,3-二羟丙基)-2,4,6-三碘-1,3-苯二甲酰胺("化合物B")进行乙酰化。优选地,在乙酰化反应之后,试剂和溶剂混合物被蒸馏以供再利用。