Evaluation of the Effect of Macrocyclic Ring Size on [<sup>203</sup>Pb]Pb(II) Complex Stability in Pyridyl-Containing Chelators
作者:Brooke L. McNeil、Karthika J. Kadassery、Anthony W. McDonagh、Wen Zhou、Paul Schaffer、Justin J. Wilson、Caterina F. Ramogida
DOI:10.1021/acs.inorgchem.2c01114
日期:2022.6.27
chelator structure, ability to incorporate the radiometal, and metal–complex stability is needed to help design appropriate chelators for clinical use. Herein, we report an investigation into the effect of ring size in macrocyclic chelators where pyridine, an intermediate Lewis base, acts as an electron donor toward lead. Crown-4Py (4,7,13,16-tetrakis(pyridin-2-ylmethyl)-1,10-dioxa-4,7,13,16-tetraazacyclooctadecane)
作为元素等效的治疗诊断对,铅 203 ( 203 Pb, 100% EC, 半衰期 = 51.92 h) 和铅 212 ( 212 Pb, 100% β –, 半衰期 = 10.64 h),分别通过在其衰变链中发射 γ 射线和 α 粒子,可以帮助开发针对晚期和目前无法治愈的癌症的个性化靶向放射性核素治疗。由于这些同位素目前用于临床试验,因此需要了解螯合剂结构、结合放射性金属的能力和金属复合物稳定性之间的关系,以帮助设计适合临床使用的螯合剂。在此,我们报告了对大环螯合剂中环大小影响的研究,其中吡啶(一种中间路易斯碱)作为铅的电子供体。Crown-4Py (4,7,13,16-tetrakis(pyridin-2-ylmethyl)-1,10-dioxa-4,7,13,16-tetraazacyclooctadecane), cyclen-4Py (1,4,7,10- tetrakis(pyridin-2-ylmethyl)-1