4-Aminopyridine is a clinically approved drug to improve motor symptoms in multiple sclerosis. A fluorine-18-labeled derivative of this drug, 3-[18F]fluoro-4-aminopyridine, is currently under investigation for positron emission tomography (PET) imaging of demyelination. Herein, the Yamada-Curtius reaction has been successfully applied for the preparation of this PET radioligand with a better radiochemical yield and improved specific activity. The overall radiochemical yield was 5 to 15% (n = 12, uncorrected) with a specific activity of 37 to 148 GBq/μmol (end of synthesis) in a 90 minute synthesis time. It is expected that this 1 pot Yamada-Curtius reaction can be used to prepare similar fluorine-18-labeled amino substituted heterocycles.
4-
氨基吡啶是一种经临床批准用于改善多发性硬化症运动症状的药物。目前正在研究这种药物的
氟-18标记衍
生物--3-[18F]
氟-4-
氨基吡啶,用于脱髓鞘的正电子发射断层扫描(PET)成像。在这里,Yamada-Curtius 反应被成功应用于制备这种 PET 放射
配体,其放射
化学收率更高,比活度也更高。在 90 分钟的合成时间内,总体放射
化学收率为 5%至 15%(n = 12,未校正),比活度为 37 至 148 GBq/μmol(合成结束)。预计这种 1 波 Yamada-Curtius 反应可用于制备类似的
氟-18 标记的
氨基取代杂环。