Two novel, highly fluorinated macrocyclic chelators with highly branched and spherically symmetric fluorocarbon moieties have been designed and efficiently synthesized. This is achieved by conjugating a spherically symmetric fluorocarbon moiety to the macrocyclic chelator DOTA, with or without a flexible oligo-oxyethylene linker between these two parts. As a result of the spherical symmetry, all 27 fluorine atoms in each fluorinated chelator give a sharp singlet 19F NMR signal. The hydrophilicity and the 19F relaxation behavior of fluorinated chelators can be modulated by the insertion of a flexible linker between the fluorocarbon moiety and the macrocyclic linker. These chelators serve as prototypes for 1H-19F dual nuclei magnetic resonance imaging agents.
设计并高效合成了两种新型高度
氟化的宏环
螯合剂,它们具有高度分支且球形对称的
氟碳部分。通过将一个球形对称的
氟碳部分与宏环
螯合剂DOTA结合,并在两者之间加入或不加入一个柔性的聚氧
乙烯连接链,实现了这一合成。由于球形对称性,每个
氟化
螯合剂中的27个
氟原子在19F核磁共振谱中产生一个尖锐的单峰信号。通过在
氟碳部分和宏环连接链之间插入一个柔性连接链,可以调节
氟化
螯合剂的亲
水性和19F弛豫行为。这些
螯合剂作为1H-19F双核磁共振成像试剂的原型。