Organoselenium Catalyzed Electrochemical Cascade Cyclization: An Access to Naphthofuran‐2‐carboxaldehyde
摘要:
We have developed an approach for the construction of naphthofuran‐2‐carboxaldehyde derivatives utilizing the synergy of electrochemical oxidation and organo‐selenium catalysis at room temperature. The compatibility of various functional groups and scalability of this protocol demonstrate the practicality of the electrochemical strategy. The synthetic utility of this strategy is furthermore demonstrated by synthesizing diversified molecules through downstream transformations.
Synthesis of Novel 3-Bromo-2H-chromene Derivatives: Palladium-Mediated Intramolecular Cyclization of Aryl Propargyl Ethers
作者:Paramasivan Perumal、Gurunathan Savitha、Kulandhai Felix
DOI:10.1055/s-0029-1217563
日期:2009.8
presence of catalytic amount of Pd(OAc) 2 in conjunction with stoichiometric amount of CuBr 2 and LiBr to the corresponding 3-bromo-2H-chromene derivatives in good yields. The protocol was further extended to synthesize 3-bromo-benzofused 2H-chromene derivatives.
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。
Microwave-assisted Claisen rearrangement of naphthyl 2-propynyl ethers: synthesis of naphthofurans
作者:V.S. Prasada Rao Lingam、Dnyaneshwar H. Dahale、Kagga Mukkanti、Balasubramanian Gopalan、Abraham Thomas
DOI:10.1016/j.tetlet.2012.08.053
日期:2012.10
An efficient two-step approach for the synthesis of naphtho[1,2-b]furans and naphtho[2,1-b]furans has been developed. Various functionalized propargyl alcohols were etherified with alpha- or beta-naphthol under Mitsunobu reaction conditions to give naphthyl 2-propynyl ethers, which underwent a facile microwave-assisted Claisen rearrangement and concomitant anionic cyclization to yield naphthofuran derivatives under basic reaction conditions. (c) 2012 Elsevier Ltd. All rights reserved.