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.
Synthesis of Chalcogenylchromenes through Cyclization of Propargylic Aryl Ethers
作者:Paola S. Hellwig、Angelita M. Barcellos、Roberta Cargnelutti、Thiago Barcellos、Gelson Perin
DOI:10.1021/acs.joc.2c01490
日期:2022.11.18
We describe here for the first time the synthesis of 2-(chalcogenyl)-3H-benzo[f]chromenes and the new 3-(phenylselanyl)-2H-chromenes by the radical or electrophilic cyclization of propargylic aryl ethers in the presence of diorganyl diselenides or ditellurides using Oxone as a green oxidant and acetonitrile as solvent in a sealed tube at 100 °C. In this study, thirty-one chalcogenylchromenes with a
我们在这里首次描述了通过炔丙基芳基醚在使用 Oxone 作为绿色氧化剂和乙腈作为溶剂在 100 °C 的密封管中制备二有机基二硒化物或二碲化物。在这项研究中,以中等至优异的产率 (50–98%) 制备了 31 种具有广泛底物范围的硫属基色烯,包括源自天然产物的化合物。
Synthesis of 3,4-Disubstituted 2<i>H</i>-Benzopyrans through C−C Bond Formation via Electrophilic Cyclization
作者:Shilpa A. Worlikar、Tanay Kesharwani、Tuanli Yao、Richard C. Larock
DOI:10.1021/jo062234s
日期:2007.2.1
[GRAPHIC]The electrophilic cyclization of substituted propargylic aryl ethers by I-2, ICl, and PhSeBr produces 3,4-disubstituted 2H-benzopyrans in excellent yields. This methodology results in vinylic halides or selenides under mild reaction conditions and tolerates a variety of functional groups, including methoxy, alcohol, aldehyde, and nitro groups.