Dual Stimulatory and Inhibitory Effects of Fluorine-Substitution on Mutagenicity: An Extension of the Enamine Epoxide Theory for Activation of the Quinoline Nucleus.
Rhenium(<scp>i</scp>) complexation–dissociation strategy for synthesising fluorine-18 labelled pyridine bidentate radiotracers
作者:Mitchell A. Klenner、Bo Zhang、Gianluca Ciancaleoni、James K. Howard、Helen E. Maynard-Casely、Jack K. Clegg、Massimiliano Massi、Benjamin H. Fraser、Giancarlo Pascali
DOI:10.1039/d0ra00318b
日期:——
novel fluorine-18 method employing rhenium(I) mediation is described herein. The method was found to afford moderate to high radiochemical yields of labelled rhenium(I) complexes. Subsequent thermal dissociation of the complexes enabled the radiosynthesis of fluorine-18 labelled pyridine bidentate structures which could not be radiofluorinated hitherto. This rhenium(I) complexation–dissociation strategy
本文描述了一种采用铼 ( I ) 介体的新型氟 18 方法。发现该方法可提供中等至高的标记铼 ( I ) 配合物的放射化学产率。随后配合物的热解离使得能够放射合成氟-18 标记的吡啶二齿结构,这些结构迄今为止不能被放射氟化。这种铼 ( I ) 络合-解离策略进一步应用于 [ 18 F]CABS13(一种阿尔茨海默病显像剂)以及其他 2,2'-联吡啶、1,10-菲咯啉和 8-羟基喹啉标记的放射性示踪剂的放射合成。反应机理的计算模型表明,铼的效率(I) 活化可能归因于金属中心的吸电子效应和酰基氟中间体的形成,该中间体在亲核加成后锚定氟化物。
Synthesis of fluorine-containing 1,10-phenanthrolines using mild versions of Skraup and Doebner-von Miller reactions
A versatile route for the synthesis of new 1,10-phenanthroline derivatives with fluorine-containing groups is described. Skraup reactions were performed with yields of 19 up to 48% and overall yields of 5 up to 13% based on different fluorinated anilines as starting materials. Ten formerly unknown derivatives were synthesized and characterized by NMR spectroscopy (1H, 13C, 19F), ESI mass spectrometry
The selective electrochemical fluorination of alkenes, phenanthroline, naphthalene and chlorobenzene in neat amine-HF mixtures is described, together with the chemistry of 4,4-difluorocyclohexadienone.