Radical (Phenylsulfonyl)difluoromethylation of Isocyanides with PhSO2CF2H under Transition-Metal-Free Conditions
摘要:
An atom-economical method for radical (phenylsulfonyl)difluoromethylation of isocyanides with PhSO2CF2H under transition-metal-free conditions has been developed. A PhSO2CF2 radical is generated through the oxidation of PhSO2CF2- after the deprotonation of PhSO2CF2F1 in one pot. The reaction exhibits excellent functional-group tolerance and the resulting products can be further modified with the removal of a PhSO2 group to give other CF2-containirfg compounds.
Radical Fluoroalkylation of Isocyanides with Fluorinated Sulfones by Visible-Light Photoredox Catalysis
作者:Jian Rong、Ling Deng、Ping Tan、Chuanfa Ni、Yucheng Gu、Jinbo Hu
DOI:10.1002/anie.201510533
日期:2016.2.18
visible‐light photoredox catalysis. A wide range of readily available mono‐, di‐, and trifluoromethyl heteroaryl sulfones can thus be used as efficient radical fluoroalkylation reagents under mild conditions. This method not only describes a new syntheticapplication of fluorinated sulfones, but also provides a new route to fluoroalkyl radicals.
2,4,5,6-Tetrakis(3,6-di-tert-butyl-9H-carbazol-9-yl)isophthalonitrile (4CzIPN-tBu) was developed as a photocatalyst for the phosphorus-radical-initiated cascade cyclization reaction of isocyanides. By using 4CzIPN-tBu as catalyst, we developed a visible-light-induced proton-coupled electron transfer strategy for the generation of phosphorus-centered radicals, via which a wide range of phosphorylated
Visible-Light-Driven Difluoromethylation of Isocyanides with <i>S</i>-(Difluoromethyl)diarylsulfonium Salt: Access to a Wide Variety of Difluoromethylated Phenanthridines and Isoquinolines
作者:Wen-Bing Qin、Wei Xiong、Xin Li、Jia-Yi Chen、Li-Ting Lin、Henry N. C. Wong、Guo-Kai Liu
DOI:10.1021/acs.joc.0c00816
日期:2020.8.21
variety of difluoromethylated phenanthridines and isoquinolines is herein described. Electrophilic S-(difluoromethyl)diarylsulfonium salt proved to be a good difluoromethyl radical precursor under photoredox catalysis. A broad range of isocyanides were tolerated to furnish the corresponding difluoromethylated phenanthridines, isoquinolines, furo[3,2-c]pyridine, and pyrido[3,4-b]indole in moderate to
本文描述了一种有效的方法,将可见光驱动的异氰酸酯基自由基二氟甲基化处理,以使用各种二氟甲基化菲啶和异喹啉。在光氧化还原催化下,亲电S-(二氟甲基)二芳基ulf盐被证明是良好的二氟甲基自由基前体。在温和的条件下,宽范围的异氰化物可以中等至极好的收率提供相应的二氟甲基化菲啶,异喹啉,呋喃[3,2- c ]吡啶和吡啶并[3,4- b ]吲哚。还提出了一个合理的机制。
xanthate-based radicaladdition/cyclization reaction cascade toward 2-biphenylisocyanides is described as a practical and modular approach to 6-alkylated phenanthridines. The use of xanthates as radical precursors allowed the synthesis of diversely 6-substituted phenanthridines. Electrophilicradicals derived from nitriles, aromatic and aliphatic ketones, malonates, and amide derivatives, as well as radicals
Silver‐catalyzed Radical Cascade Arylthiodifluoromethylation/ Cyclization of Isonitriles for the Synthesis of 6‐Phenanthridinyldifluoromethyl Aryl Thioethers
A radicalisonitrile insertion cascade reaction was studied to synthesis of 6-phenanthridinyldifluoromethyl aryl thioethers via oxidative decarboxylation of arylthiodifluoroacetic salt process under silver-catalyzed conditions.