Electrochemical Oxidative [4+2] Annulation for the π‐Extension of Unfunctionalized Heterobiaryl Compounds
作者:Xia Hu、Lei Nie、Guoting Zhang、Aiwen Lei
DOI:10.1002/anie.202003656
日期:2020.8.24
biological activities, regioselective access to fused aromatic compounds is significantly important in the field of organic materials and pharmaceutical science. Herein, we developed electrochemical oxidative [4+2] annulationreactions of heterobiaryl compounds with alkynes or alkenes, leading to the formation of several polycyclic heteroaromatic compounds. This electrosynthetic methodology serves for
Dearomatization Silylation of Benzofurans and Furopyridines via Silyl Radical Addition and Endocyclic C–O Bond Scission
作者:Benqiang Cui、Ye Tian、Yongchao Gao、Shaoyi Hua、Yanhui Shi、Changsheng Cao
DOI:10.1021/acs.joc.3c01162
日期:2023.8.4
further derivatization reactions to achieve more valuable compounds. Cleavage of heteroaromatic endocyclic carbon–heteroatom bonds to assemble C–Si bonds is scarce. Here, we demonstrate a dearomatization silylation of benzofurans and furopyridines via silyl radical addition and C(2)–Obond scission under metal-catalyst-free and mild conditions. Preliminary mechanistic experiments suggest that these transformations
A variety of 2-hydroxybenzophenones on reaction with Corey-Chaykovsky reagent underwent unprecedented rearrangements leading to 3-substituted benzofurans 8 and one-carbon homologated compounds 9 and 12. Compounds 9 could further be quantitatively transformed to 2-substituted benzofuran derivatives 10. (c) 2008 Elsevier Ltd. All rights reserved.
Exogenous-oxidant-free electrochemical oxidative C–H sulfonylation of arenes/heteroarenes with hydrogen evolution
An efficient and environmentally benign electrochemical oxidative radical C–H sulfonylation of arenes/heteroarenes was developed in this work. A series of significant diarylsulfones were prepared under mild catalyst- and exogenous-oxidant-free reaction conditions, which efficiently avoid the issues of desulfonylation or over-reduction of sulfonyl groups.
Palladium(II)-catalyzed intramolecular addition of arylboronic acids to ketones
作者:Guixia Liu、Xiyan Lu
DOI:10.1016/j.tet.2008.05.056
日期:2008.7
A palladium(II)-catalyzed intramolecular addition of arylboronic acids to ketones was developed. Compared to Pd(OAc)2 catalysis system, cationic palladium complex with dppp as the ligand has higher catalytic activity and efficiency for wider scope of substrates. From this reaction, the normal addition product or the dehydrated product could be selectively furnished as controlled by additives. Highly