申请人:——
公开号:US06056939A1
公开(公告)日:2000-05-02
Metal complexes of new ligands of the formula ##STR1## are useful as agents for medical imaging, particularly MRI, for in vitro or in vivo diagnostic or as radiopharmaceuticals. In these compounds, X--R.sup.1 --Y is a coordinating group able to form a highly stable complex with metal ions. Suitable units are for example derivatives of ortho-phenanthroline or of an hydroxamic acid. R.sup.2 and R.sup.3 are reactive functions such as amines or carboxylic groups. R.sup.4 and R.sup.5 are ligands, for instance diethylenetriaminepentaacetic acid 1,4,7,10-tetraacetic acid (DTPA), 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) or 1,4,8,11-tetraazacyclotetradecane-N, N', N", N'"-tetraacetic acid (TETA), of a different type than the X--R.sup.1 --Y units and able to strongly encapsulate metal ions with which the X--R.sup.1 --Y moieties form less stable chelates. Stable high molecular weight multimetallic entities are spontaneously formed by these ligands that spontaneously associate around metal ions through the X--R.sup.1 --Y units. Higher relaxivities thus are achieved. Mixed-complexes containing two different radionuclides are also obtained thus allowing imaging and therapy with one single chelate.
新配体的金属配合物(化学式为##STR1##)可用作医学成像剂,特别是MRI,用于体内或体外诊断或作为放射性药物。在这些化合物中,X-R.sup.1-Y是一个配位基团,能够与金属离子形成高度稳定的配合物。适当的基团例如是邻菲啰啉或羟肟酸的衍生物。R.sup.2和R.sup.3是反应性功能,例如胺或羧基。R.sup.4和R.sup.5是配体,例如二乙三胺五乙酸(DTPA)、1,4,7,10-四乙酸环十二烷(DOTA)或1,4,8,11-四氮杂环四十二烷-N,N',N",N'"-四乙酸(TETA),与X-R.sup.1-Y基团不同类型,能够强烈地包覆金属离子,X-R.sup.1-Y基团形成的螯合物较不稳定。这些配体通过X-R.sup.1-Y基团自发地与金属离子结合,形成稳定的高分子量多金属实体。因此,实现了更高的弛豫度。同时还可以获得含有两种不同放射性核素的混合配合物,从而实现一种单一螯合物的成像和治疗。