One-Step Synthesis of Substituted Benzofurans from <i>ortho</i>
- Alkenylphenols <i>via</i>
Palladium-Catalyzed CH Functionalization
作者:Dejun Yang、Yifei Zhu、Na Yang、Qiangqiang Jiang、Renhua Liu
DOI:10.1002/adsc.201600082
日期:2016.6.2
A dehydrogenative oxygenation of C(sp2)H bonds with intramolecular phenolic hydroxy groups has been developed, which provides a straightforward and concise access to structurally diversely benzofuransfrom ortho‐alkenylphenols. The reaction is catalyzed by palladium on carbon (Pd/C) without any oxidants and sacrificing hydrogen acceptors.
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.
Synthesis of benzofurans from the cyclodehydration of α-phenoxy ketones mediated by Eaton’s reagent
作者:Zhanwei Ma、Min Zhou、Lin Ma、Min Zhang
DOI:10.1177/1747519820907244
日期:2020.7
acid) is used to prepare 3-substituted or 2,3-disubstituted benzofurans with moderate to excellent yields under mild conditions. The method provides a facile access to benzofurans from readily available starting materials such as phenols and α-bromo ketones. The reaction is highly efficient, which is attributed to the good reactivity and fluidity of Eaton’s reagent. The reaction can be applied to prepare
Visible light enabled [4+2] annulation reactions for anthracenone-furans from 2,3-dibromonaphthoquinone and phenylbenzofurans
作者:Zhimei Mao、Aimin Huang、Lin Ma、Min Zhang
DOI:10.1039/d1ra07314a
日期:——
A facile visible light promoted [4 + 2] annulation reaction from readily available starting materials using an organo-photocatalyst gave anthracenone-furans with up to 95% yield in one-pot.