2-[(4-[18F]Fluorobenzoyloxy)methyl]-1,4-naphthalenedione ([18F]1) was synthesised as a putative hypoxia imaging agent from 2-hydroxymethyl 1,4-naphthoquinone (7) and 4-[18F]fluorobenzoic acid ([18F]8) using dicyclohexyl carbodiimide (DCC) to activate [18F]8. This coupling reaction was fast and gave quantitative yields. Further investigations are warranted on the use of DCC as a coupling agent in Positron Emission Tomography. The synthesis including HPLC purification and reformulation has been fully automated on a modified FDG synthesiser with two reactor vials. [18F]1 was produced in a radiochemical yield of 27 ± 5%, with a radiochemical purity of 97.5% and a specific activity of 78.4–134.5 GBq/µmol at the end of synthesis (n = 23). The total synthesis time including reformulation was 65 min. [18F]1 was found to be stable in plasma and saline, but underwent rapid metabolism in a phase 1 metabolite assay using rat S9 liver fractions. An in vivo evaluation of [18F]1 in transplanted, hypoxic SK-RC-52 tumour-bearing BALB/c nude mice revealed the tumour-to-muscle ratio to be 2.4 ± 0.1 at 2 h post-injection. Copyright © 2011 John Wiley & Sons, Ltd.
2-[(4-[18F]
氟苯甲酯)甲基]-
1,4-萘醌 ([18F]1) 是一种假定的缺氧成像剂,通过将 2-羟基甲基-
1,4-萘醌 (7) 与
4-[18F]氟苯甲酸 ([18F]8) 结合,使用二环己基碳二
亚胺 (
DCC) 激活 [18F]8 进行合成。这一偶联反应迅速,产率达到定量。关于
DCC 作为正电子发射断层扫描(PET)
偶联剂的进一步研究是必要的。合成过程包括 HPLC 净化和再配制,已在改装的 FDG 合成仪中完全自动化,使用两个反应瓶。最终合成的 [18F]1 以 27 ± 5% 的放射
化学产率生产,放射
化学纯度为 97.5%,特异活性在合成结束时为 78.4–134.5 GBq/µmol (n = 23)。包括再配制在内的总合成时间为 65 分钟。[18F]1 在血浆和生理盐
水中稳定,但在使用大鼠 S9 肝脏部分进行的第一阶段代谢物测定中迅速代谢。在移植的缺氧 SK-RC-52 肿瘤小鼠 BALB/c 裸鼠中对 [18F]1 的体内评估显示,注射后 2 小时的肿瘤与肌肉比为 2.4 ± 0.1。版权所有 © 2011 John Wiley & Sons, Ltd.