Visible light-mediated difluoroalkylation of electron-deficient alkenes
作者:Vyacheslav I Supranovich、Vitalij V Levin、Marina I Struchkova、Jinbo Hu、Alexander D Dilman
DOI:10.3762/bjoc.14.139
日期:——
A method for the reductive difluoroalkylation of electron-deficientalkenes using 1,1-difluorinated iodides mediated by irradiation with blue light is described. The reaction involves radicaladdition of 1,1-difluorinated radicals at the double bond followed by hydrogen atom transfer from sodium cyanoborohydride.
Stereoselective three-component cascade synthesis of α-substituted 2,4-dienamides from <i>gem</i>-difluorochloro ethanes
作者:Shyamsundar Das、Nakeun Ko、Eunsung Lee、Sang Eun Kim、Byung Chul Lee
DOI:10.1039/c9cc07100h
日期:——
Herein, we describe a new transition metal-free Claisen rearrangement for the synthesis of α-substituted 2,4-dienamides. The one-pot, stereoselective three-component cascade reaction between a series of propargyl alcohols, amines, and gem-difluorochloro ethane derivatives afforded various polysubstituted 2,4-dienamides in good yields. This synthetic method for 1,1-captodative dienes, α-substituted
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
Interaction of <i>gem</i>
-Difluorinated Iodides with Silyl Enol Ethers Mediated by Photoredox Catalysis
作者:Grigory N. Chernov、Vitalij V. Levin、Vladimir A. Kokorekin、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1002/adsc.201700423
日期:2017.9.4
A method for the synthesis of β,β‐difluorinated ketones by coupling of α,α‐difluorinated iodides with silyl enol ethers is described. The reaction is performed in the presence of iridium(III) photocatalysts under the irradiation with 400 nm light emitting diodes.
Photocatalytic Reductive Fluoroalkylation of Nitrones
作者:Vyacheslav I. Supranovich、Vitalij V. Levin、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1021/acs.orglett.7b03987
日期:2018.2.2
A method for the addition of fluorinated groups to nitrones using an iridium photocatalyst and ascorbic acid as a stoichiometric reducing agent is described. The reaction proceeds through the generation of fluorinated radicals by single-electron reduction of fluorinated alkyl iodides with an iridium complex mediated by visible light. Besides perfluorinated reagents, partially fluorinated alkyl iodides