A Zwitterionic Palladium(II) Complex as a Precatalyst for Neat-Water-Mediated Cross-Coupling Reactions of Heteroaryl, Benzyl, and Aryl Acid Chlorides with Organoboron Reagents
A zwitterionic palladium(II) complex has been found to be an efficient catalyst for Suzuki–Miyaura cross‐coupling reactions of aryl and heteroaryl organoboron reagents with various heteroaryl chlorides, aryl‐ and heteroarylmethyl chlorides, and aryl acid chlorides in neat water.
accomplished the synthesis of 2-substituted benzofuran derivatives by the palladium-catalyzed reaction of 3-substituted propargylic carbonates with phenols. The 2-substituted benzofuran derivatives were obtained through the intermolecularcoupling of the 3-substituted propargylic carbonates with phenols, and sequential intramolecular cyclization reaction.
Impregnated Copper(II) Oxide on Magnetite as Catalyst for the Synthesis of Benzo[<i>b</i>
]furans from 2-Hydroxyarylcarbonyl Derivatives and Alkynes
作者:Juana M. Pérez、Diego J. Ramón
DOI:10.1002/ejoc.201600671
日期:2016.9
o-hydroxybenzaldehydes with alkynes in the presence of 4-methylbenzenesulfonohydrazide was carried out in ethanol as a nontoxic biorenewable solvent and in the presence of impregnated copper(II) oxide on magnetite as a heterogeneous catalyst. The catalyst can be easily removed from the reaction medium by a simple magnetic decantation, and the reaction can be performed with a very low copper loading. The in situ
邻羟基苯甲醛与炔烃在 4-甲基苯磺酰肼存在下的偶联-烯丙基化-环化反应序列在乙醇中进行,乙醇作为无毒的生物可再生溶剂,并在磁铁矿上浸渍的氧化铜(II)作为多相催化剂存在。通过简单的磁倾析可以很容易地从反应介质中去除催化剂,并且反应可以在非常低的铜负载下进行。起始的氧化铜 (II) 纳米粒子原位还原成铜 (0) 片材使得催化剂的可回收性变得不可能。该反应的多功能性通过使用不同的邻羟基苯乙酮得到 2,3-二取代的苯并 [b] 呋喃来证明。该反应可以在克规模上进行而没有任何并发症。
CuBr-Catalyzed Coupling of <i>N-</i>Tosylhydrazones and Terminal Alkynes: Synthesis of Benzofurans and Indoles
作者:Lei Zhou、Yi Shi、Qing Xiao、Yizhou Liu、Fei Ye、Yan Zhang、Jianbo Wang
DOI:10.1021/ol103009n
日期:2011.3.4
A new method for the synthesis of benzofurans or indoles via ligand-free CuBr-catalyzed coupling/cyclization of terminalalkynes with N-tosylhydrazones derived from o-hydroxy- or o-aminobenzaldehydes has been developed. A wide range of functional groups were found that are able to tolerate the reaction conditions.