The present invention relates to a process for producing 1, 4, 7, 10-tetraazacyclododecane-1, 4, 7, 10-tetraacetic acid (DOTA) including salts and hydrates thereof of general formula (I) from the respective cyclen. Said process further involves the use of cationic- and anionic exchange resins and solvent treatments to remove the organic and inorganic contaminants. Any cations present in the raw DOTA or other contaminants resulting from the reaction of cyclen are largely reduced in early stages of the process allowing to obtain good yields of DOTA in a purified grade and in an easier and reliable way. The present invention is thus useful for the production of DOTA, of macrocyclic compounds comprising metal ions complexes thereof and of compositions comprising said macrocyclic compounds that can be used as contrast agents for magnetic resonance imaging.
本发明涉及一种生产
1,4,7,10-四氮杂环十二烷-1,4,7,10-四乙酸(DO
TA)及其盐和
水合物的方法,其通式为(I),该方法进一步涉及使用阳离子和阴离子交换
树脂和溶剂处理以去除有机和无机污染物。在该过程的早期阶段,原始的DO
TA中存在的任何阳离子或由cyclen反应产生的其他污染物都被大大减少,从而使得可以更容易地、可靠地获得高纯度的DO
TA,并获得良好的收率。因此,本发明对于生产DO
TA、包括其
金属离子配合物的大环化合物以及包括该大环化合物的组合物,可用作磁共振成像对比剂,具有实用价值。