The synthesis of chelators that form high stability complexes with copper(II) isotopes and do not suffer from transchelation in vivo has been a goal for many chemists. Such chelators will facilitate the exploitation of the 64Cu isotope (t1/2 = 12.7 h, β+ (19%); β− (39%); EC (41%)) for positron emission tomography imaging studies, which has a longer half life relative to the more commonly used 18F (t1/2 = 109.8 min) and 11C (t1/2 = 20.4 min) isotopes. One option is the CBTE2A chelator, which has been championed by Weisman, Wong and Anderson, and, more recently, alternate bifunctional chelator (BFC) versions have been synthesised. Improved synthetic methods are required for unsymmetric derivatisation of these chelators to allow more selective biomolecule attachment. This work investigates synthetic routes to form new unsymmetric chelating ligands via stepwise reaction of the bisaminal precursor, determines their X-ray structures and demonstrates cold copper(II) isotope complex formation.
合成能与
铜(II)同位素形成高稳定性络合物且在体内不会发生转切作用的
螯合剂一直是许多
化学家的目标。这种
螯合剂将有助于利用 64Cu 同位素(t1/2 = 12.7 小时,β+ (19%);β- (39%);
EC (41%))进行正电子发射断层成像研究,相对于更常用的 18F(t1/2 = 109.8 分钟)和 11C(t1/2 = 20.4 分钟)同位素,64Cu 的半衰期更长。其中一种选择是 CBTE2A
螯合剂,该
螯合剂一直由 Weisman、Wong 和 Anderson 倡导使用,最近又合成了替代的双功能
螯合剂 (BFC) 版本。这些
螯合剂的非对称衍生化需要改进的合成方法,以实现更具选择性的
生物分子附着。这项工作研究了通过双
氨基前体的逐步反应形成新的不对称螯合
配体的合成路线,确定了它们的 X 射线结构,并展示了冷
铜(II)同位素络合物的形成。