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
Reactions of o-alkenyloxyarenediazonium fluoroborates and related species with nitroxides
作者:Athelstan L. J. Beckwith、Gordon F. Meijs
DOI:10.1039/c39810000595
日期:——
Treatment of arenediazonium fluoroborates bearing suitable alkenyloxy- or alkenylamino-ortho-substituents affords ring-closed hydroxylamine derivatives via a free-radical mechanism: similar treatment of o-alkynyloxy- or o-alkynylamino-arenediazonium salts gives aldehydes.
Formation of functionalized dihydrobenzofurans by radical cyclization
作者:Gordon F. Meijs、Athelstan L. J. Beckwith
DOI:10.1021/ja00279a038
日期:1986.9
Etude de la cyclisation de tetrafluoroborates d'allyloxy-2 benzenediazonium induite par des agents de thiodediazoniation et des reactifs suivies de dediazoniation de type «Sandmeyer»
四氟硼酸盐 d'allyloxy-2 benzodiazonium induite par des agent de thiodediazoniation et des reactifs suivies de dediazoniation de type «Sandmeyer»
Radical Carbonylation Mediated by Continuous-Flow Visible-Light Photocatalysis: Access to 2,3-Dihydrobenzofurans
作者:Nenad Micic、Anastasios Polyzos
DOI:10.1021/acs.orglett.8b01971
日期:2018.8.3
The annulative carbonylation of alkenyl-tethered arenediazonium salts using visible-light photocatalysis in continuous flow is described. The method furnishes a diverse series of novel acetate-functionalized 2,3-dihydrobenzofurans at room temperature and moderate CO pressure (25 atm), delivering these products in a short time with straightforward scale-up. This continuous flow and free-radical approach