Cu-Mediated C–H <sup>18</sup>F-Fluorination of Electron-Rich (Hetero)arenes
作者:Matthew S. McCammant、Stephen Thompson、Allen F. Brooks、Shane W. Krska、Peter J. H. Scott、Melanie S. Sanford
DOI:10.1021/acs.orglett.7b01902
日期:2017.7.21
to form a (mesityl)(aryl)iodonium salt. This salt is then used in situ in a Cu-mediated radiofluorination with [18F]KF. This approach leverages the stability and availability of electron-rich arene starting materials to enable mild late-stage radiofluorination of toluene, anisole, aniline, pyrrole, and thiophene derivatives. The radiofluorination has been automated to access a 41 mCi dose of an 18F-labeled
Catalyst-Free Aromatic Radiofluorination via Oxidized Iodoarene Precursors
作者:Young-Do Kwon、Jeongmin Son、Joong-Hyun Chun
DOI:10.1021/acs.orglett.8b03450
日期:2018.12.21
Oxidizediodoarenes (OIAs), prepared via mCPBA-mediated oxidation, have been demonstrated as versatile precursors for the synthesis of [18F]fluoroarenes in the absence of catalysts. OIAs have been identified as intermediates in single-pot syntheses of iodonium salts and ylides but have never been recognized as radiofluorinationprecursors. Here, the isolated OIAs were used without any catalysts to
Ring-Closing Synthesis of Dibenzothiophene Sulfonium Salts and Their Use as Leaving Groups for Aromatic <sup>18</sup>F-Fluorination
作者:Thibault Gendron、Kerstin Sander、Klaudia Cybulska、Laure Benhamou、Pak Kwan Brian Sin、Aqsa Khan、Michael Wood、Michael J. Porter、Erik Årstad
DOI:10.1021/jacs.8b06730
日期:2018.9.5
Herein, we report a novel intramolecular ring-closing reaction of biaryl thioethers that give access to highly functionalized dibenzothiophene sulfonium salts under mild conditions. The resulting precursors react regioselectively with [18F]fluoride to give [18F]fluoroarenes in predictable radiochemical yields. The strategy expands the available radiochemical space and provides superior labeling efficiency
在此,我们报道了联芳基硫醚的一种新型分子内闭环反应,该反应可以在温和条件下获得高度官能化的二苯并噻吩锍盐。所得前体与[ 18 F]氟化物发生区域选择性反应,以可预测的放射化学产率生成[ 18 F]氟芳烃。该策略扩大了可用的放射化学空间,并为临床相关 PET 示踪剂提供了卓越的标记效率。
The synthesis of [18F]fluoroarenes from the reaction of cyclotron-produced [18F]fluoride ion with diaryliodonium salts
作者:Aneela Shah、Victor W. Pike、David A. Widdowson
DOI:10.1039/a802349b
日期:——
Diaryliodonium salts have been shown to react with fluoride ion at 80 °C in acetonitrile to generate aryl fluorides. The regioselectivity is controlled electronically and by the bulk of the ortho-substituents on the rings, with the latter the dominant factor such that electron-rich rings can be fluorinated. ortho-Substituted aryl fluorides can be selectively produced from unsymmetrical diaryliodonium salts. The
An Investigation of (Diacetoxyiodo)arenes as Precursors for Preparing No-Carrier-Added [<sup>18</sup>F]Fluoroarenes from Cyclotron-Produced [<sup>18</sup>F]Fluoride Ion
作者:Mohammad B. Haskali、Sanjay Telu、Yong-Sok Lee、Cheryl L. Morse、Shuiyu Lu、Victor W. Pike
DOI:10.1021/acs.joc.5b02332
日期:2016.1.4
Treatment of (diacetoxyiodo)arenes (1a-1u) with cyclotron-produced [(18)F]fluorideion rapidly affords no-carrier-added [(18)F]fluoroarenes (2a-2u) in useful yields and constitutes a new method for converting substituted iodoarenes into substituted [(18)F]fluoroarenes in just two steps.