Addition of 1,3-dicarbonyl compounds to terminal alkynes catalyzed by a cationic cobalt(<scp>iii</scp>) complex
作者:Mohan Chandra Sau、Manish Bhattacharjee
DOI:10.1039/d0ra05923d
日期:——
The Nakamura reaction using a cationic cobalt(III) complex, [Cp*Co(CH3CN)3][SbF6]2 as the catalyst under neutral and aerobic conditions at 110 °C has been described. In solution, the complex is expected to lose a hemilabile acetonitrile ligand to produce a highly electron-deficient cobalt(III) center, and the Lewis acidic nature of the cobalt center has been exploited for the enolization of the dicarbonyl
已经描述了使用阳离子钴( III ) 配合物[Cp*Co(CH 3 CN) 3 ][SbF 6 ] 2作为催化剂在中性和有氧条件下在110 °C 下的Nakamura 反应。在溶液中,该配合物预计会失去半可溶的乙腈配体,从而产生高度缺电子的钴(III) 中心,并且钴中心的路易斯酸性已被用于二羰基化合物的烯醇化。1,3-二羰基化合物与炔烃反应得到相应的烯基衍生物。然而,苯乙炔及其衍生物与 β-酮酯反应得到相应的三联苯化合物。已经基于原位LCMS 测量提出了反应机制的细节。
[EN] METHOD OF FORMING A MULTI-SUBSTITUTED BENZENE COMPOUND<br/>[FR] MÉTHODE DE FORMATION D'UN COMPOSÉ BENZÈNE MULTI-SUBSTITUÉ
申请人:UNIV NANYANG TECH
公开号:WO2016013976A1
公开(公告)日:2016-01-28
The invention relates to a method of forming a multi-substituted benzene compound. In particular, the method involves benzene construction via organocatalytic formal [3+3] cycloaddition reaction.
Aerobic Oxidative N-Heterocyclic Carbene-Catalyzed Formal [3+3] Cyclization for the Synthesis of Tetrasubstituted Benzene Derivatives
作者:Sara Bacaicoa、Ellymay Goossens、Henrik Sundén
DOI:10.1021/acs.orglett.2c03879
日期:2022.12.16
Herein, we present an accessible aerobic N-heterocyclic carbene (NHC)-catalyzed method that efficiently produces tetrasubstituted benzene rings in a single reaction. The method employs atmospheric oxygen (O2) as the terminal oxidant in a reaction that requires two oxidative steps. The aerobic oxidation is achieved by a selection of electron transfer mediators orchestrating a redox cascade, turning
在此,我们提出了一种可获得的好氧 N-杂环卡宾 (NHC) 催化方法,该方法可在单个反应中有效地产生四取代苯环。该方法在需要两个氧化步骤的反应中使用大气中的氧气 (O 2 ) 作为末端氧化剂。有氧氧化是通过选择协调氧化还原级联的电子转移介质实现的,将高能有氧氧化反应途径转变为有利的过程。