卤化铟(III)催化邻炔基苯酚的加氢烷氧基化反应,以高收率提供苯并[ b ]呋喃。反应的进行与5-内切-挖区域选择性与各种在芳烃官能酚类和以高产率使用的InI炔基部分3在DCE(5摩尔%)。实验和计算研究支持了基于炔烃的铟(III)π-路易斯酸活化,然后进行苯酚的亲核加成和最终的原金属脱金属,得到相应的苯并[ b ]呋喃的机理。DFT计算表明二聚体In 2 I 6 是通过与炔烃和羟基的新型双配位而催化的物质。
Efficient microwave-assisted one-pot three-component synthesis of 2,3-disubstituted benzofurans under Sonogashira conditions
作者:Nataliya A. Markina、Yu Chen、Richard C. Larock
DOI:10.1016/j.tet.2013.02.003
日期:2013.4
efficient one-pot method for the synthesis of 2,3-disubstituted benzo[b]furans from commercially available 2-iodophenols, terminal acetylenes and aryl iodides has been developed utilizing Sonogashira reaction conditions. After an initial Sonogashira coupling of the 2-iodophenol with the terminal alkyne, cyclization involving the aryl iodide provides the 2,3-disubstituted benzo[b]furan in good to excellent
A copper-catalyzed electrophilic, umpolung amination strategy for the direct C-H amination of polyfluoroarenes and 1,3-azoles has been developed. The copper-based amination reaction is robust and can be easily scaled up on a gram scale. Its application to an annulative electrophilic amination of o-alkynylphenols and -anilines for the synthesis of 3-aminobenzofurans and -indoles is also described.
Gold-Catalyzed Enynal and Enynol Coupling by Selectively Steering Two Transient Vinyl-Gold Intermediates
作者:Zipeng Wang、Tongxiang Cao、Shifa Zhu
DOI:10.1021/acs.orglett.2c03890
日期:2022.12.23
bond is easily accessible but less exploited in homogeneous gold catalysis, which possesses weak nucleophilicity and would be likely to undergo protodemetalation. Herein, a gold-catalyzed enynal and enynol coupling by selectively steering two transient vinyl-gold intermediates is realized under mild conditions. It exhibits high atom economy and good tolerance of functional groups with the added benefit
A novel and straightforward methodology for palladium-catalyzed carbopalladation-initiated domino carbonylative cyclization to construct bisheterocycles has been established. With TFBen as an efficient and convenient CO source, the protocol is capable of generating oxindole and 3-acylbenzofuran/3-acylindole moieties from the corresponding N-(o-iodoaryl)acrylamides and o-alkynylphenols/o-alkynylanilines
已经建立了一种用于钯催化碳钯化引发的多米诺羰基环化以构建双杂环的新颖且直接的方法。以 TFBen 作为一种高效便捷的 CO 源,该方案能够从相应的N -( o -iodoaryl) 丙烯酰胺和o -炔基酚/ o - 炔基苯胺生成 oxindole 和 3-酰基苯并呋喃/3-acylindole 部分,形成三种一步操作中的 C-C 键和一个 C-O/C-N 键。以中等至优异的产率制备了多种带有羟吲哚和 3-酰基苯并呋喃/3-酰基吲哚的双杂环,具有良好的官能团耐受性。
An Annulative Electrophilic Amination Approach to 3-Aminobenzoheteroles
A copper-catalyzed annulative amination approach to 3-aminobenzofurans and -indoles from o-alkynylphenols and -anilines has been developed. The Cu-based catalysis is based on an umpolung, electrophilic amination with O-benzoyl hydroxylamines and enables the mild and convergent synthesis of various 3-aminobenzoheteroles of biological and pharmaceutical interest. Some mechanistic investigations and an application of this protocol to construction of more complex tricyclic framework are also described.