Specific Sequestering Agents for the Actinides. 28. Synthesis and Initial Evaluation of Multidentate 4-Carbamoyl-3-hydroxy-1-methyl-2(1H)-pyridinone Ligands for in Vivo Plutonium(IV) Chelation
作者:Jide Xu、Birgitta Kullgren、Patricia W. Durbin、Kenneth N. Raymond
DOI:10.1021/jm00014a013
日期:1995.7
2-HOPO ligands promoted as much or slightly more Pu excretion than an equal molar amount of the octadentate 3,4,3-LI(1,2-HOPO), the previously most effective in vivo ligand. Surprisingly, although plutonium has an eight-coordination requirement, tetra- and hexadentate Me-3,2-HOPO ligands were essentially as effective as the one octadentate ligand studied. These observations suggest that even the tetradentate
报道了基于4-(取代的氨基甲酰基)-3-羟基-2-吡啶酮的螯合剂的新家族。这些在氮上具有任选的末端取代基,并且羟基吡啶酮(HOPO)环通过酰胺键连接至分子主链。甲基取代的配体衍生物(Me-3,2-HOPOs)的一个非常重要的特征是,类似于铁载体肠杆菌素及其类似物的儿茶酰胺酰胺配合物,这些HOPO衍生物在酰胺质子和相邻质子之间形成强氢键金属络合物中酚盐的氧;这增强了复合物的稳定性。如在生理条件下观察到的,这种刚性有助于解释Me-3,2-HOPO配体对p(IV)的巨大亲和力。与注射Pu的对照组相比,研究的所有13种化合物均显着增强了小鼠的Pu排泄。与同等摩尔量的CaNa3-DTPA(当前临床使用的化合物)相比,研究的八种配体促进了更多的Pu排泄。与等摩尔量的八齿3,4,3-LI(1,2-HOPO)同等摩尔量相比,五种注射和两种口服Me-3,2-HOPO配体促进的Pu排泄量增加或略多。体内配体。