Borderline metal catalysts, Bi(OTf)3 and Fe(OTf)3, were proven to work as dual activators for alkynes and N,O-acetals via σ,π-chelation, which achieved a new carboarylation reaction of alkynylarenes with N,O-acetals.
Palladium-Catalyzed Tandem Oxidative Arylation/Olefination of Aromatic Tethered Alkenes/Alkynes
作者:Yang Gao、Yinglan Gao、Wanqing Wu、Huanfeng Jiang、Xiaobo Yang、Wenbo Liu、Chao-Jun Li
DOI:10.1002/chem.201605351
日期:2017.1.18
We describe herein a palladium‐catalyzed tandem oxidative arylation/olefination reaction of aromatic tethered alkenes/alkynes for the synthesis of dihydrobenzofurans and 2 H‐chromene derivatives. This reaction features a 1,2‐difunctionalization of C−C π‐bond with two C−H bonds using O2 as terminal oxidant at room temperature. The products obtained are valuable synthons and important scaffolds in biological
Synthesis of 3‐Organoselenyl‐2
<i>H</i>
‐Coumarins from Propargylic Aryl Ethers via Oxidative Radical Cyclization
作者:Jun‐Dan Fang、Xiao‐Biao Yan、Li Zhou、Yu‐Zhao Wang、Xue‐Yuan Liu
DOI:10.1002/adsc.201801565
日期:2019.4.23
A metal‐free oxidative radical cyclization/selenylation of propargylic arylethers with diaryl diselenides was developed. This protocol provided an alternative method to synthesize 3‐organoselenyl‐2H‐coumarins via the formation of C−Se bond, C−C bond, and C=O bond in one step. Moreover, a broad range of functional groups (such as halogen, aldehyde, ketone, cyano, and nitro group) were tolerated.
Silver-Catalyzed Chlorocyclization for the Synthesis of 3-Chloro-2<i>H</i>-chromenes
作者:Yunhao Tang、Weidong Pan、Yuzhu Yang
DOI:10.1021/acs.joc.2c02864
日期:2023.7.21
A silver-catalyzed chlorocyclization reaction of aryl 3-aryl-2-propyn-1-yl ethers in the presence of NCS under darkness was accomplished, which provides a straightforward and efficient access to 3-chloro-2H-chromenes.