Trifluoromethyl ethers R-OCF3 are easily synthesized from the corresponding dithiocarbonates R-OCS2Me (R = aryl or primary alkyl) by a reagent system consisting of 70% HF/pyridine and an N-halo imide. When the reaction is applied to R-OCS2Me wherein R = secondary alkyl, tertiary alkyl, or benzylic group, fluorination leading to the corresponding alkyl fluorides R-F is achieved, whereas a combination
Light‐Mediated Formal Radical Deoxyfluorination of Tertiary Alcohols through Selective Single‐Electron Oxidation with TEDA
<sup>2+.</sup>
作者:Francisco José Aguilar Troyano、Frederic Ballaschk、Marcel Jaschinski、Yasemin Özkaya、Adrián Gómez‐Suárez
DOI:10.1002/chem.201903702
日期:2019.11.7
The synthesis of tertiary alkyl fluorides through a formal radical deoxyfluorination process is described herein. This light-mediated, catalyst-free methodology is fast and broadly applicable allowing for the preparation of C-F bonds from (hetero)benzylic, propargylic, and non-activated tertiary alcohol derivatives. Preliminary mechanistic studies support that the key step of the reaction is the single-electron
Synthesis of Alkyl Fluorides by Silver‐Catalyzed Radical Decarboxylative Fluorination of Cesium Oxalates
作者:Émilie Vincent、Julien Brioche
DOI:10.1002/ejoc.202100344
日期:2021.5.7
Readily available from alcohols, cesium oxalates undergo radical deoxyfluorination reaction in the presence of silver salts catalyst and Selectfluor® to produce alkyl fluorides. Herein, the scope of the fluorination protocol and a brief mechanistic study is described.