Palladium-Catalyzed Oxidative Insertion of Carbon Monoxide to N-Sulfonyl-2-aminobiaryls through C–H Bond Activation: Access to Bioactive Phenanthridinone Derivatives in One Pot
摘要:
Palladium-catalyzed oxidative carbonylation of N-sulfonyl-2-aminobiaryls through C-H bond activation and C-C, C-N bond formation under TFA-free and milder conditions has been developed. The reaction tolerates a variety of substrates and provides biologically important phenanthrldlnone derivatives in yields up to 94%.
Electrochemical initiation of electron-catalyzed phenanthridine synthesis by trifluoromethylation of isonitriles
作者:M. Lübbesmeyer、D. Leifert、H. Schäfer、A. Studer
DOI:10.1039/c7cc09302k
日期:——
The electron-catalyzed formation of phenanthridines starting from isonitriles initiated by an electrochemical reduction of the Togni reagent is presented. The required number of faradays per mole of starting material and the respective yields clearly show the catalytic character of the electron in this reaction. The mechanism is supported by cyclic voltammetry experiments.
Photoredox-Catalyzed Tandem Insertion/Cyclization Reactions of Difluoromethyl and 1,1-Difluoroalkyl Radicals with Biphenyl Isocyanides
作者:Zuxiao Zhang、Xiaojun Tang、William R. Dolbier
DOI:10.1021/acs.orglett.5b02061
日期:2015.9.18
Usingvisible-lightphotoredox conditions, difluoromethylation and 1,1-difluoroalkylation of biphenyl isocyanides have allowed the synthesis of a series of 6-(difluoromethyl)- and 6-(1,1-difluoroalkyl)phenanthridines via tandem addition/cyclization/oxidation processes. The reactions are carried out in wet dioxane at room temperature using fac-Ir(ppy)3 as catalyst to form a large variety of substituted
Preparation of 6-Difluoromethylphosphonated Phenanthridines by Visible-Light-Driven Radical Cyclization of 2-Isocyanobiphenyls
作者:Shuang Wang、Wen-Liang Jia、Lin Wang、Qiang Liu
DOI:10.1002/ejoc.201500988
日期:2015.11
A protocol to obtain a variety of 6-difluoromethylenephosphonated phenanthridines through a radicalcyclization process was explored. These reactions, performed with the use of diethyl bromodifluoromethylphosphonate as a radical resource and 2-isocyanobiphenyls as radical acceptors, were smoothly triggered by visible-light photocatalysis. Electron-withdrawing and electron-donating groups were well