irradiation from a compact fluorescent lamp, low-intensity UV lamp, or sunlight. This protocol can be applied to the synthesis of perfluoroalkyl-substituted phenanthridines as well as effect the iodo-perfluoroalkylation of alkenes/alkynes and the C–H perfluoroalkylation of electron-rich arenes and heteroarenes. This C–H perfluoroalkylation reaction offers a unique method for site-selective labeling of oligopeptides
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。
Catalyst-free synthesis of phenanthridines <i>via</i> electrochemical coupling of 2-isocyanobiphenyls and amines
Catalyst free synthesis of 6-aryl phenanthridines and amides through an electrochemicalreaction is reported in this study. The couplingreaction proceeds by the cathodic reduction of in situ formed diazonium ions, which are formed from anilines and an alkyl nitrite. The generated aryl radical diazonium ions coupled from isocyanides furnished the desired products in good yields. This cascade reaction was
该研究报道了通过电化学反应无催化剂合成6-芳基菲啶和酰胺。通过阴极还原由苯胺和亚硝酸烷基酯形成的原位形成的重氮离子进行偶联反应。由异氰酸酯偶联生成的芳基自由基重氮鎓离子以良好的收率提供了所需的产物。该级联反应在室温下以n Bu 4 NBF 4作为电解质在配备有RVC作为阳极且Pt作为阴极的不分隔电池中进行。还进行了一系列详细的机理研究,包括自由基时钟实验和循环伏安法分析。
Synthesis of Highly Functionalized Polycyclic Quinoxaline Derivatives Using Visible-Light Photoredox Catalysis
作者:Zhi He、Minwoo Bae、Jie Wu、Timothy F. Jamison
DOI:10.1002/anie.201408522
日期:2014.12.22
A mild and facile method for preparing highly functionalized pyrrolo[1,2‐a]quinoxalines and other nitrogen‐rich heterocycles, each containing a quinoxaline core or an analogue thereof, has been developed. The novel method features a visible‐light‐induced decarboxylative radical coupling of ortho‐substituted arylisocyanides and radicals generated from phenyliodine(III) dicarboxylate reagents and exhibits
When 1-(2-isocyanophenyl)pyrrole was treated with a catalytic amount of boron trifluoride, pyrrolo[1,2-a] quinoxaline was obtained almost quantitatively. The reaction in the presence of aldehydes or ketones gave the corresponding 4-(1-hydroxyalkyl)pyrrolo[1,2-a]quinoxalines in moderate to good isolated yields.