Synthesis of 3‐Organoselenyl‐2
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‐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 Tetrasubstituted α,β‐Unsaturated Aldehydes
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Radical 1,4‐Aryl Migration/Trifluoromethylthiolation Cascade Reaction of Aryl Propynyl Ethers
作者:Chun‐Huan Guo、Dao‐Qian Chen、Si Chen、Xue‐Yuan Liu
DOI:10.1002/adsc.201700534
日期:2017.9.4
A one‐pot synthesis of tetrasubstituted acrylaldehydes via difunctionalization of aryl propynyl ethers has been achieved, which involves a trifluoromethylthiolation process and a radical 1,4‐aryl migration from oxygen to carbon. The reaction shows excellent conversion of aryl propynyl ethers into trifluoromethyl‐containing α,β‐unsaturated aldehydes through a radical pathway.
Studies on Acetylenic Compounds. XXXII. Ring Closure of Propargyl Ethers. (2).
作者:Issei Iwai、Junya Ide
DOI:10.1248/cpb.11.1042
日期:——
This is a new synthetic method for various 4-substituted-3-chromenes : phenyl propargyl ethers underwent intramolecular cyclization to give 4-chromene derivatives by heating with diethylaniline. The reaction mechanism was clarified by the study of substituted phenyl propargyl ethers under the consideration of their electronic effects on the yields of resulting 3-chromene ; in general, the presence of +R group enhanced the cyclization, whereas -R group gave much lower yields of the corresponding chromenes. Therefore, this intramolecular cyclization is concluded to be an electrophilic reaction.
Assembly of 3-(trifluoromethyl)thiochromenes via a regioselective trifluoromethylthioarylation of (3-arylprop-2-ynyl)oxybenzenes with trifluoromethanesulfanylamide
作者:Tong Liu、Guanyinsheng Qiu、Qiuping Ding、Jie Wu
DOI:10.1016/j.tet.2016.01.053
日期:2016.3
trifluoromethanesulfanylamide is reported, which affords 3-(trifluoromethyl)thiochromenes in good yields with high regioselectivity. The reaction works efficiently in the presence of 2.0 equiv of bismuth chloride, and different functional groups can be compatible under the conditions. The related (3,4-dihydronaphthalen-2-yl) (trifluoromethyl)sulfane and 3-((trifluoromethyl)thio)-1,2-dihydroquinoline can be generated
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。