Syntheses of bifunctional 2,3-diamino propionic acid-based chelators as small and strong tripod ligands for the labelling of biomolecules with 99mTc
作者:Yu Liu、Bruno L. Oliveira、João D. G. Correia、Isabel C. Santos、Isabel Santos、Bernhard Spingler、Roger Alberto
DOI:10.1039/c002796k
日期:——
The labelling of targeting biomolecules requires small and hydrophilic complexes in order to not affect the binding properties of the vectors. 2,3-Diamino propionic acid (dap) is a small and strong, albeit scarcely used, tripod ligand for the fac-[99mTc(CO)3]+ moiety. We have introduced at the α-carbon atom in the basic dap structure various second functionalities such as carboxylato, amino and α-amino acid groups via various spacers in order to yield bifunctional chelators. These dap derivatives can be coupled to targeting molecules for application in molecular imaging. Full characterizations of the bifunctional chelators, X-ray structures of intermediates and of one rhenium complex, as well as labelling studies with 99mTc, are presented.
靶向生物分子的标记需要小而亲水的复合物,以免影响载体的结合特性。2,3-二氨基丙酸(dap)是一种小巧且强力的三脚架配体,尽管使用较少,但适用于fac-[99mTc(CO)3]+基团。我们在基本的dap结构的α碳原子上引入了各种第二功能基团,如羧酸根、氨基和α-氨基酸基团,通过不同的连接体,以便获得双功能螯合剂。这些dap衍生物可以与靶向分子偶联,以应用于分子成像。本文展示了双功能螯合剂的完整表征,中间体和一个铼配合物的X射线结构,以及与99mTc的标记研究。