Arenesulfonyl Fluoride Synthesis via Copper-Catalyzed Fluorosulfonylation of Arenediazonium Salts
作者:Yongan Liu、Donghai Yu、Yong Guo、Ji-Chang Xiao、Qing-Yun Chen、Chao Liu
DOI:10.1021/acs.orglett.0c00484
日期:2020.3.20
We report herein a general and practical copper-catalyzed fluorosulfonylation reaction of a wide range of abundant arenediazonium salts to smoothly prepare various arenesulfonylfluorides using the 1,4-diazabicyclo[2.2.2]octane-bis(sulfur dioxide) adduct as a convenient sulfonyl source in combination with KHF2 as an ideal fluorine source and without the need for additional oxidants. Interestingly,
Visible-light mediated sulfonylation of thiols <i>via</i> insertion of sulfur dioxide
作者:Akshay M. Nair、Shreemoyee Kumar、Indranil Halder、Chandra M. R. Volla
DOI:10.1039/c9ob01040h
日期:——
mediated synthesis of thiosulfonates via a radical–radical coupling of sulfenyl radicals and arylsulfonyl radicals was developed. The reaction of thiols, aryldiazonium tetrafluoroborates and DABSO proceeded at room temperature using 5 mol% eosin Y. The reaction displayed wide functional group tolerance and delivered the unsymmetrical thiosulfonates in good to excellent yields.
Herein we report a general electrochemical strategy for the Sandmeyer reaction. Using electricity as the driving force, this protocol employs a simple and inexpensive halogen source, such as NBS, CBrCl3, CH2I2, CCl4, LiCl and NaBr for the halogenation of aryl diazonium salts. In addition, we found that these electrochemical reactions could be performed using anilines as the starting material in a one-pot
本文中,我们报告了桑德迈尔反应的一般电化学策略。使用电作为驱动力,该协议采用一种简单且廉价的卤素源,例如NBS,CBrCl 3,CH 2 I 2,CCl 4,LiCl和NaBr进行芳基重氮盐的卤化。另外,我们发现这些电化学反应可以以一锅的方式使用苯胺作为起始原料来进行。此外,该方法的实用性在使用非常便宜的石墨作为电极的多克规模的芳基卤化物的合成中得到了证明。已经进行了一系列详细的机理研究,包括自由基时钟和自由基清除剂研究,循环伏安分析和原位电子顺磁共振(EPR)分析。
An efficient approach to 3-thioether-functionalized 2,3-dihydrobenzofurans via a metal-free intramolecular radical cyclization/thiolation cascade reaction
作者:Tingting Chen、Renhua Zheng、Jingmiao Yu
DOI:10.1080/00397911.2021.1927098
日期:2021.7.18
Abstract A diverse series of 3-thioether-functionalized 2,3-dihydrobenzofurans were prepared by an intramolecular radical cyclization/thiolation cascade reaction of alkenyl-tethered arenediazonium salts with thiophenols under transition-metal-free conditions. The mild and practical reaction conditions tolerated various functional groups and afforded the corresponding 2,3-dihydrobenzofurans in moderate
Some intramolecular reactions of ortho-substituted aryl radicals
作者:Athelstan L. J. Beckwith、William B. Gara
DOI:10.1039/p29750000593
日期:——
ortho-Substitutedarylradicals have been generated by reduction of arenediazonium salts in aqueous solution by use of a flow cell. The e.s.r. spectra indicate that radicals containing olefinic bonds in the 5,6- or 6,7-positions with respect to the radical centre undergo rapid cyclization by addition to the 5- and 6-positions respectively to give the thermodynamically less stable products. No evidence