Free-Radical Cascade Alkylarylation of Alkenes with Simple Alkanes: Highly Efficient Access to Oxindoles via Selective (sp<sup>3</sup>)C–H and (sp<sup>2</sup>)C–H Bond Functionalization
作者:Zejiang Li、Ye Zhang、Lizhi Zhang、Zhong-Quan Liu
DOI:10.1021/ol4032478
日期:2014.1.17
A copper-catalyzed alkylarylation of alkenes with simple alkanes was achieved, which not only provided an efficient method to prepare various alkyl-substituted oxindoles, but also represented a novel strategy for selective sp3 C–H functionalization/C–C bond formation via a free-radical cascade process. Additionally, selective activation of unactivated (sp3)C–H and (sp2)C–H bonds by one single step
Decarboxylative Synthesis of Functionalized Oxindoles via An Iron-Initiated Radical Chain Process and Application in Constructing Diverse Fused-Indoline Heterocycles
作者:Zhihao Cui、Da-Ming Du
DOI:10.1002/adsc.201700976
日期:2018.1.4
Rapid construction of diverse fused‐indoline−heterocycle (FIH) frameworks including high‐value pyrroloindolines, furoindolines and thienoindolines in a two‐step sequence has been described. The key to success hinges on the adoption of peresters as α‐heteroatom alkyl radical precusors, which can smoothly react with N‐arylacrylamides via a radical chain process initiated by inexpensive FeCl2⋅4H2O to
Copper-catalyzed trifluoromethylation of N-arylacrylamides “on water” at room temperature
作者:Fang Yang、Piyatida Klumphu、Yong-Min Liang、Bruce H. Lipshutz
DOI:10.1039/c3cc48131j
日期:——
A copper-catalyzed intramolecular trifluoromethylation of arylacrylamides leads to oxindole derivatives, effected with stable and inexpensive Langlois' reagent (CF3SO2Na). These reactions proceed via a radical process in water at room temperature. The aqueous solution can be recycled.
visible-light-driven cascade cyclization reaction to synthesize 3-methyl-3-acetophenone-2-oxindoles and 3-methyl-3-(methylsulfonyl)benzene-2-oxindoles in yields up to 96% and 99%, via benzoyl and phenylsulfinyl radicals with acrylamide derivatives is reported, respectively. Extensive studies, including gram-scale, radical capture and isotope experiments, were performed to indicate that the reaction may involve a radical
Visible-Light-Mediated Generation of Acyl Radicals from Triazine Esters
作者:Tao Wang、Yuan-Yuan Zong、Wan-Zhong Feng、Li-Zhu Wu、Qiang Liu
DOI:10.1021/acs.joc.3c01377
日期:2023.9.1
Acyl radicals are significant synthetic active species in organic synthesis. However, their generation via green and compatible methods remains challenging. Herein, we report an unprecedented visible-light-mediated approach for generating aryl acyl radicalsfrom readily available triazine esters. This protocol with mild and redox-neutral conditions affords a diverse array of oxindoles attached to alcohol