Direct Hydrofluorination of Methallyl Alkenes Using a Methanesulfonic Acid/Triethylamine Trihydrofluoride Combination
作者:Xavier Bertrand、Jean-François Paquin
DOI:10.1021/acs.orglett.9b03950
日期:2019.12.6
The use of a methanesulfonic acid/triethylamine trihydrofluoride combination for the direct hydrofluorination of methallyl-containing substrates is reported. Under those metal-free conditions that use readily available, cheap, and easy to handle reagents, a range of methallyl alkenes could be converted to their corresponding tertiary fluoride in up to 78% yield. Finally, a promising result for the
The effect of two electron-withdrawing groups on remote tertiary hydrogens susceptible to electrophilic fluorination using F2
作者:Chava Gal、Shlomo Rozen
DOI:10.1016/s0022-1139(00)82295-2
日期:1982.7
The direct electrophilic fluorination of unactivated remotetertiaryhydrogens is effected by the number, nature and distance of electron-withdrawing groups. The effect of these groups on reducing electron density of the tertiary CH bond seems to be additive. The more remote these groups are from the reaction center, the higher the yield of the fluorination.
Predictable site-selective radical fluorination of tertiary ethers
作者:Junyang Ma、Wentao Xu、Jin Xie
DOI:10.1007/s11426-019-9636-8
日期:2020.2
site-selective radical fluorination of readily available tertiaryalkyl ethers, enabled by synergistic photocatalysis and organocatalysis. This catalytic combination allows for exclusive fluorination of tertiary C-O bonds under mild conditions even in the presence of competing reaction sites. The excellent functional group tolerance affords valuable access to sterically hindered alkyl fluorides through
Selective Radical Fluorination of Tertiary Alkyl Halides at Room Temperature
作者:He Chen、Zhonglin Liu、Ying Lv、Xinqiang Tan、Haigen Shen、Hai-Zhu Yu、Chaozhong Li
DOI:10.1002/anie.201708197
日期:2017.11.27
described. The halogen‐exchange fluorination proceeds efficiently in acetonitrile at roomtemperature under metal‐free conditions and exhibits a wide range of functional group compatibility. Furthermore, the reactions are highly selective in that alkyl chlorides and primary and secondary alkyl bromides remain intact. A radical mechanism is proposed for this selective fluorination.