Development of indazolylpyrimidine derivatives as high-affine EphB4 receptor ligands and potential PET radiotracers
作者:Kristin Ebert、Jens Wiemer、Julio Caballero、Martin Köckerling、Jörg Steinbach、Jens Pietzsch、Constantin Mamat
DOI:10.1016/j.bmc.2015.06.040
日期:2015.9
as precursors were developed and labeled with carbon-11 and fluorine-18, respectively. For this purpose, a protecting group strategy essentially had to be generated to prevent unwanted methylation and to enable the introduction of fluorine-18. Further, a convenient radiolabeling strategy using [11C]methyl iodide was established which afforded the isotopically labeled radiotracer in 30–35% RCY (d.c.)
由于其在癌症的发病机理中的重要作用,Eph(产生促红细胞生成素的肝癌细胞系A2)受体酪氨酸激酶家族的成员代表了分子成像的有希望的候选者。因此,描述了通过正电子发射断层扫描(PET)对EphB4受体进行非侵入性成像的新型放射性示踪剂的开发和制备。首先,对已知高度与EphB4亲和的吲唑基嘧啶铅化合物进行了计算机分析,以确定引入氟18保留亲和力的有利标记位置。基于此,分别开发了参考化合物和前体,并分别用碳11和氟18标记。以此目的,基本上必须产生保护基策略以防止不希望的甲基化并能够引入氟18。此外,使用[建立了11 C]甲基碘,该同位素以30-35%RCY(dc)提供了同位素标记的放射性示踪剂,与原始抑制剂分子相同。制备了螺铵前体,用于氟18的放射性标记。不幸的是,在选择的条件下,标记未导致所需的18 F-放射性示踪剂。