Visible-light mediated regioselective (phenylsulfonyl)difluoromethylation of fused imidazoles with iododifluoromethyl phenyl sulfone
作者:Guojie Yin、Mei Zhu、Weijun Fu
DOI:10.1515/hc-2017-0101
日期:2017.8.28
A visible-light catalyzed direct and regioselective (phenylsulfonyl)difluoromethylation of imidazo[1,2-a]pyridines and benzo[d]-imidazo [2,1-b]thiazoles with readily available PhSO2CF2I under mild conditions was developed. This synthetic methodology enables the introduction of a CF2SO2Ph group in an efficient and regioselective reaction through C-Hbondfunctionalization with a broad substrate scope
Chlorodifluoromethyl phenyl sulfone, a previously unknown compound that can be readily prepared from non-ODS-based precursors, was found to act as a robust difluorocarbene reagent for O- and N-difluoromethylations.
A novel method for the synthesis of aryl trihalomethyl sulfones and their derivatization: the search for new sulfone fungicides
作者:Maciej D. Korzyński、Krzysztof M. Borys、Justyna Białek、Zbigniew Ochal
DOI:10.1016/j.tetlet.2013.12.012
日期:2014.1
for the preparation of bioactive aryl trihalomethyl sulfones is reported. An iodination reaction with iodine bromide is applied for the synthesis of difluoroiodomethyl aryl sulfones. A series of difluoroiodomethylsulfonyl group bearing derivatives is afforded, including nitroanilines and benzimidazoles. Biological studies show high fungicidal activity for a number of the synthesized sulfones.
Visible Light-Promoted Phosphine-Catalyzed Difluoroalkylation of Arenes and Heterocycles
作者:Heng Lu、Dong-yu Wang、Ao Zhang
DOI:10.1021/acs.joc.9b02882
日期:2020.1.17
A visible light-promoted difluoroalkylation reaction of arenes or heterocycles, using triaryl phosphine as the catalyst and difluoroalkyl iodide as the alkylating agent, is presented. The strategy is highlighted by photocatalyst-free, mild reaction conditions and a broad substrate scope. Mechanistic experiments indicate that this reaction involves a radical-chain process that is initiated by an electron
Nickel‐Catalyzed Carbofluoroalkylation of 1,3‐Enynes to Access Structurally Diverse Fluoroalkylated Allenes
作者:Kai‐Fan Zhang、Kang‐Jie Bian、Chao Li、Jie Sheng、Yan Li、Xi‐Sheng Wang
DOI:10.1002/anie.201813184
日期:2019.4
A nickel‐catalyzed 1,4‐carbofluoroalkylation of 1,3‐enynes to access structurally diverse fluoroalkylated allenes has been established. This method has demonstrated high catalytic reactivity, mild reaction conditions, broad substrate scope, and excellent functional‐group tolerance. The key to success is the use of a nickel catalyst to generate different fluoroalkyl radicals from readily available and