Radiosynthesis of (
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F]GE387: A Potential PET Radiotracer for Imaging Translocator Protein 18 kDa (TSPO) with Low Binding Sensitivity to the Human Gene Polymorphism rs6971
作者:Luxi Qiao、Emily Fisher、Lindsay McMurray、Selena Milicevic Sephton、Matthew Hird、Nisha Kuzhuppilly‐Ramakrishnan、David J. Williamson、Xiouyun Zhou、Eryn Werry、Michael Kassiou、Saijinder Luthra、William Trigg、Franklin I. Aigbirhio
DOI:10.1002/cmdc.201900023
日期:2019.5.6
Translocator protein (TSPO) is a biomarker of neuroinflammation, which is a hallmark of many neurodegenerative diseases and has been exploited as a positron emission tomography (PET) target. Carbon-11-labelled PK11195 remains the most applied agent for imaging TSPO, despite its short-lived isotope and low brain permeability. Second-generation radiotracers show variance in affinity amongst subjects
转运蛋白(TSPO)是神经炎症的生物标志物,是许多神经退行性疾病的标志,已被用作正电子发射断层扫描(PET)靶标。尽管碳同位素标记的同位素寿命短且脑通透性较低,但碳11标记的PK11195仍然是TSPO成像最常用的试剂。第二代放射性示踪剂显示了受TSPO基因的遗传多态性(rs6971)引起的受试者(低亲和力,高亲和力和低亲和力)之间的亲和力差异。为了克服这些限制,基于TSPO药效团探索了一种新的结构支架,其低亲和力/高亲和力(LAB / HAB)比与(R)相似(1.2 vs. 1.3)的类似物研究了-[11 C] PK11195。参比化合物的合成分六个步骤完成,总收率为9%,并通过八个步骤制备了前体,总产率为8%。参考和前体化合物的手性分离是使用超临界流体色谱法(> 95%ee)进行的。绝对构型由圆二色性确定。手动放射性标记反应条件的优化表明乙腈是100°C的首选溶剂。该放射性标记方法的自动化提供了分别为21