Pd-Catalyzed Sequential CC and CN Bond Formations for the Synthesis of N-Heterocycles: Exploiting Protecting Group-Directed CH Activation under Modified Reaction Conditions
作者:Byung Seok Kim、Sun Young Lee、So Won Youn
DOI:10.1002/asia.201100024
日期:2011.8.1
addition reaction of N‐Ts‐2‐arylanilines with activated olefins has been achieved at ambient temperature under the newly defined reaction conditions. This process highlighted the directing effect of the N‐protecting group in CHactivation, displayed broad substrate scope with wide functional group compatibility; thus rendering a straightforward entry to a wide variety of N‐heterocycles such as d
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.
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。
TfOH-Promoted Transition-Metal-Free Cascade Trifluoroethylation/Cyclization of Organic Isothiocyanates by Phenyl(2,2,2-trifluoroethyl)iodonium Triflate
作者:Cheng-Long Zhao、Qiu-Yan Han、Cheng-Pan Zhang
DOI:10.1021/acs.orglett.8b02793
日期:2018.10.19
An efficient and transition-metal-free method for the synthesis of the structurally diversified trifluoroethylthiol phenanthridines and 3,4-dihydroisoquinolines is described. Various 2-isothiocyanobiaryls and aryl alkyl isothiocyanates reacted with phenyl(2,2,2-trifluoroethyl)iodoniumtriflate in CH2Cl2 in the presence of trifluoromethanesulfonic acid at 40 °C to form the corresponding trifluoroet
Transition-Metal-Free Direct Arylation of Anilines
作者:Tracey Pirali、Fengzhi Zhang、Anna H. Miller、Jenna L. Head、Donald McAusland、Michael F. Greaney
DOI:10.1002/anie.201106150
日期:2012.1.23
Aryne arylation: A new method of directarylation is reported for aniline substrates. The reaction uses benzyne to synthesize a variety of aminobiaryls under mild conditions (see scheme), requiring no stoichiometric metalation or transition‐metal catalysis. An ene mechanism is implicated, and conveys excellent functional group tolerance relative to metal‐mediated processes.