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.
Diphenyl-Diselenide-Mediated Domino Claisen-Type Rearrangement/Cyclization of Propargylic Aryl Ethers: Synthesis of Naphthofuran-2-carboxaldehyde Derivatives
作者:Jun-Dan Fang、Xiao-Biao Yan、Wu-Jie Lin、Yi-Chuan Zhao、Xue-Yuan Liu
DOI:10.1021/acs.orglett.9b02942
日期:2019.9.20
A diphenyl-diselenide-mediated Claisen-type rearrangement/cyclization of propargylic arylethers under metal-free conditions is developed, affording various naphthofuran-2-carboxaldehydes in moderate to excellent yield. The broad substrate scope and excellent functional group compatibility suggest that it can be a straightforward and powerful method to access naphthofuran-2-carboxaldehydes in a highly
Studies an Acetylenic Compounds. XXIII. A New Ring Closure of 2-Propynyl Ethers
作者:Issei Iwai、Junya Ide
DOI:10.1248/cpb.10.926
日期:——
It has been reported that 2-naphthyl allylic ethers undergo the Claisen rearrangement to give naphthol derivatives. 2-naphthyl propargyl ether derivatives, _??_-O·CH2C≡C-R (R=H, CH3, Ph.), replacing the double bond of allylic ethers by a triple bond, do not undergo the Claisen rearrangement but a new ring-closure to give 3H-naphtho [2, 1-b] pyran derivatives. Moreover, 1-naphthyl derivatives, _??_O·CH2C≡C-Phalso undergo the same ring-closure to give 4-phenyl-2H-naphtho [1, 2-b] pyran. The structures of new pyran derivatives obtained by the new ring-closure were confirmed by the melting point, infrared and ultraviolet spectra of the authentic samples which were synthesized by another routes.
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。
Facile synthesis of HFIP esters-containing 2H-benzopyrans through palladium-catalyzed one-pot cyclization/carbonylation using formic acid as the CO source
作者:Dan Wen、Boyu Yao、Xinxin Qi、Xiao-Feng Wu
DOI:10.1016/j.jcat.2024.115602
日期:2024.8
straightforward procedure for the synthesis of HFIP esters-containing 2H-benzopyrans has been established through palladium-catalyzed one-pot cyclization/carbonylation reaction of substituted propargyl ethers with HFIP by using formic acid as the CO precursor. A diverse set of 2H-benzopyrans have been formed with HFIP esters as attractive functional groups in moderate to excellent yields. This protocol features
通过使用甲酸作为 CO 前体,取代的炔丙基醚与 HFIP 进行钯催化一锅环化/羰基化反应,建立了一种有效且简单的合成含 2H-苯并吡喃 HFIP 酯的方法。以 HFIP 酯作为有吸引力的官能团,以中等至优异的产率形成了多种 2H-苯并吡喃。该协议具有广泛的底物范围和不操作有毒 CO 气体的特点。