AAZTA-based bifunctional chelating agents for the synthesis of multimeric/dendrimeric MRI contrast agents
作者:Giuseppe Gugliotta、Mauro Botta、Lorenzo Tei
DOI:10.1039/c0ob00096e
日期:——
Monomeric and dimeric bifunctional chelates based on the AAZTA (6-amino-6-methylperhydro-1,4-diazepinetetraacetic acid) platform bearing arylamino and isothiocyanate groups for conjugation to biomolecules were synthesised. Both systems were used for the preparation of high relaxivity dendrimeric (PAMAM G1) and multimeric octa-GdIII complexes. These systems show enhanced relaxometric properties attributed to the presence of two coordinated, fast exchanging, water molecules (q = 2) on each metal ion and to a rather rigid and compact molecular structure.
我们合成了基于 AAZTA(6-氨基-6-甲基全氢-1,4-二氮杂环四乙酸)平台的单体和二聚体双功能螯合物,该平台带有用于与生物大分子共轭的芳基氨基和异硫氰酸基。这两种体系均用于制备高松弛性树枝状(PAMAM G1)和多聚八-GdIII 复合物。由于每个金属离子上都有两个配位的、快速交换的水分子(q = 2),而且分子结构相当坚固紧凑,因此这些体系显示出更强的弛豫特性。