Relaxivity and Transmetallation Stability of New Benzyl-Substituted Derivatives of GadoliniumDTPA Complexes
作者:Sophie Laurent、François Botteman、Luce Vander Elst、Robert N. Muller
DOI:10.1002/hlca.200490098
日期:2004.5
In our efforts of finding new specific contrast agents of higher relaxivity and selectivity, we have prepared the two new benzyl-functionalized DTPA (‘diethylenetriamine pentaacetate’) gadolinium complexes (S)-3 and (R,S)-4, and compared their properties with those of the known regioisomers (S)-2 and (S)-1. The theoretical fitting of the reduced transverse relaxation rates of the 17O-nucleus of H2O
在寻找具有更高弛豫度和选择性的新型特殊造影剂的过程中,我们准备了两种新型的苄基官能化的DTPA(“二亚乙基三胺五乙酸盐”)g配合物(S)-3和(R,S)-4,并对其进行了比较。具有与已知的区域异构体(S)-2和(S)-1相同的性质。所述的降低的横向弛豫率的理论拟合17 H的O形核2 ø得到的水的滞留时间值(τ中号)在310 K时为86–143 ns,该值并不限制质子在体温下的弛豫性。1个H-NMRD(核磁松弛分散体)概况表明的弛豫1 - 4(- [R 1 = 4.3-5.1小号-1 毫-1在20兆赫和310 K)比用于GdDTPA母体化合物更高5。过渡金属化评估表明,除(S)-2外,所有取代的化合物都比5更稳定。配合物3、1和4对Zn 2+诱导的金属转移具有最高的稳定性(以降序排列)。显然,分别在位置5、4和2的苄基取代基的空间位阻有利地降低了Zn离子的可及性。从合成的观点来看,类型1的4