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.
Visible-light-induced tandem radical addition–cyclization of 2-aryl phenyl isocyanides catalysed by recyclable covalent organic frameworks
作者:Shuyang Liu、Wenna Pan、Songxiao Wu、Xiubin Bu、Shigang Xin、Jipan Yu、Hao Xu、Xiaobo Yang
DOI:10.1039/c9gc00022d
日期:——
A visible-light-induced tandemradicaladdition–cyclization sequence via 2-aryl phenyl isocyanides as the starting material and two-dimensional covalent organic frameworks (2D-COFs) as the photocatalyst was developed, delivering multifarious 6-substituted phenanthridines in high yields. Benefitting from the utilization of a heterogeneous photocatalyst, this protocol features easy catalyst separation
Synthesis of 6-Trifluoromethylphenanthridines through Radical Trifluoromethylation of Isocyanides with Sodium Triflinate under Visible Light
作者:Jianbin Li、Clarice A. D. Caiuby、Márcio W. Paixão、Chao-Jun Li
DOI:10.1002/ejoc.201701487
日期:2018.6.7
Trifluoromethylation enabled by photochemistry enriched the toolbox of synthetic chemists, to allow the simple and efficient installation of CF3 groups in organic molecules. Herein, we report a cascade addition/annulation reaction of 2‐isocyanobiphenyls towards the synthesis of 6‐trifluoromethylphenanthridines. It is proposed that this reaction is triggered by the CF3 radical generated from photoexcited
Synthesis of Chloro(phenyl)trifluoromethyliodane and Catalyst-Free Electrophilic Trifluoromethylations
作者:Cong Xu、Xiaoning Song、Jia Guo、Sibao Chen、Jie Gao、Jing Jiang、Fengyun Gao、Yuxin Li、Mang Wang
DOI:10.1021/acs.orglett.8b01510
日期:2018.7.6
present work deals with a challenge in the synthesis of aryltrifluoromethyliodanes (ArICF3X) and develops a direct route to PhICF3Cl via a simple ligand-exchange reaction of PhI(OCOCF3)2, Me3SiCF3, and NaCl for the first time. The I–Cl bond length in PhICF3Cl supports its iodonium character, which enables an enhanced CF3-transfer capability in electrophilic S-, O-, N-, and C-trifluoromethylations as
A photocatalyst-free, light promoted sequential radical addition/annulation of 2-isocyanobiphenyls to 6-trifluoromethyl phenanthridines with high efficiency is presented.