Fast and reliable generation of [<sup>18</sup>F]triflyl fluoride, a gaseous [<sup>18</sup>F]fluoride source
作者:A. Pees、C. Sewing、M. J. W. D. Vosjan、V. Tadino、J. D. M. Herscheid、A. D. Windhorst、D. J. Vugts
DOI:10.1039/c8cc03206h
日期:——
[18F]fluoride has been developed, omitting time consuming azeotropic drying procedures. Gaseous [18F]triflyl fluoride is formed instantaneously at room temperature from hydrated [18F]fluoride, followed by distillation in less than 5 minutes into a dry aprotic solvent, in which dry [18F]fluoride is released in presence of base with >90% radiochemical yield. The reactivity of the [18F]fluoride has been
A nickel-catalyzed, efficient C-N bond reduction of aromatic and benzylic ammonium triflates has been developed using sodium isopropoxide as a reducing agent. The high efficiency, mild conditions, and nice compatibility...
Competitive demethylation and substitution in N,N,N-trimethylanilinium fluorides
作者:Haoran Sun、Stephen G. DiMagno
DOI:10.1016/j.jfluchem.2007.03.009
日期:2007.7
Fluorination of aromatic compounds by nucleophilic displacement of trimethylanilinium salts by fluoride is a commonly used reaction for radiotracer synthesis. Though the liberated trimethylamine is thought to be an excellent leavinggroup for this type of SNAr reaction, scattered reports show that amine demethylation (reverse Menschutkin reaction) sometimes dominates over substitution, particularly when
通过氟化物的三甲基苯胺盐的亲核置换来氟化芳族化合物是放射性示踪剂合成的常用反应。尽管释放的三甲胺被认为是此类S N Ar反应的极佳离去基团,但零星的报道表明,胺的脱甲基作用(孟舒特金逆反应)有时优于取代,尤其是当相对富电子的氟代芳烃成为所需的靶标时。在这里,我们提供了三甲基苯胺脱甲基和取代的系统实验和理论研究。这些研究的结果突显了该离去基团在氟芳烃合成中的局限性,对于设计具有铵阳离子的亲核氟化剂具有重要意义。
From Anilines to Aryl Ethers: A Facile, Efficient, and Versatile Synthetic Method Employing Mild Conditions
We have developed a simple and direct method for the synthesis of arylethers by reacting alcohols/phenols (ROH) with aryl ammonium salts (ArNMe3+), which are readily prepared fromanilines (ArNR′2, R′=H or Me). This reaction proceeds smoothly and rapidly (within a few hours) at room temperature in the presence of a commercially available base, such as KOtBu or KHMDS, and has a broad substrate scope
Room Temperature Palladium-Catalyzed Cross Coupling of Aryltrimethylammonium Triflates with Aryl Grignard Reagents
作者:Jonathan T. Reeves、Daniel R. Fandrick、Zhulin Tan、Jinhua J. Song、Heewon Lee、Nathan K. Yee、Chris H. Senanayake
DOI:10.1021/ol1018739
日期:2010.10.1
Aryltrimethylammonium triflates and tetrafluoroborates were found to be highly reactive electrophiles in the Pd-catalyzed cross coupling with aryl Grignard reagents. The coupling reactions proceed at ambient temperature with a nearly stoichiometric quantity of Grignard reagent, and diverse functionality is tolerated. Competition experiments established the reactivity of PhNMe3OTf relative to PhCl,