[EN] IODINATION PROCESS FOR THE PREPARATION OF 3,5-DISUBSTITUTED-2,4,6-TRIIODO AROMATIC AMINES COMPOUNDS<br/>[FR] PROCÉDÉ D'IODATION POUR LA PRÉPARATION DE COMPOSÉS 2,4,6-TRIIODOAMINES AROMATIQUES 3,5-DISUBSTITUÉES
申请人:HOVIONE CHINA HOLDING LTD
公开号:WO2013063737A1
公开(公告)日:2013-05-10
The invention discloses a improved process for the preparation of 3,5-disubstituted- 2,4,6-triiodo aromatic amines of formula (II), wherein R1 and R2 are defined as herein. The compounds of formula (II) are the key intermediates for the synthesis of a series of non-ionic contrast agents such as Iopamidol, Iohexol and Iodixanol. The process comprises reacting chlorine-free iodinating reagents with 3,5-disubstituted-2,4,6-triiodo aromatic amines to obtain 3,5-disubstituted-2,4,6-triiodo aromatic amines of formula (II), wherein the molar yield of the iodination reaction can reach to 89%.
该发明揭示了一种改进的方法,用于制备式(I)的3,5-二取代-2,4,6-三碘芳香胺,其中R1和R2如下所定义。式(I)的化合物是一系列非离子造影剂的合成的关键中间体,例如碘帕米多、碘己醇和碘地索。该方法包括将无氯碘化试剂与3,5-二取代-2,4,6-三碘芳香胺反应,以获得式(I)的3,5-二取代-2,4,6-三碘芳香胺,其中碘化反应的摩尔产率可达89%。