Pyridinium-containing polyheterocycles exhibit distinctive biological properties, interesting electrochemical and opticalproperties, and thus are widely used as drugs, functional materials, and photocatalysts. Here, we describe a unified two-step strategy by merging Rh-catalyzed C-H vinylation with two switchable electrocyclizations, including aza-6π- and all-carbon 6π-electrocyclizations, for rapid
Ring-Closing Metathesis Approach to Heteroaromatic Cations: Synthesis of Benzo[a]quinolizinium Salts
作者:Ana Nuñez、Beatriz Abarca、Ana M. Cuadro、Julio Alvarez-Builla、Juan J. Vaquero
DOI:10.1002/ejoc.201001373
日期:2011.3
Benzo[α]quinoliziniumsalts have been synthesized through ring-closing metathesis reactions of 1-butenyl-2-vinylisoquinolinium, 2-butenyl-1-vinylisoquinolinium and 2-styryl-1-vinylpyridinium salts in the presence of Grubbs and Hoveyda-Grubbs catalysts. The results show that the last approach is the most efficient for the preparation of this heteroaromatic tricyclic system and several previously unknown
Unexpected Pyridinyl Group Mediated Metal-Free Wacker-Type Oxidation en Route to Pyrido[2,1-a]isoindol-5-ium Salts
作者:Yandong Zhang、Dong Shi、Tao Zeng、Xin Lei、Xiaotong Wu、Mansirun Li
DOI:10.1055/a-1938-2521
日期:2022.12
A two-step approach to rapidly access a diverse array of pyrido[2,1-a]isoindol-5-ium salts from 2-pyridinylstyrenes through an unprecedented pyridinyl group mediated metal-free Wacker-type oxidation and an acid-mediated cyclization has been developed. As a part of the mechanistic investigation of this novel Wacker-type oxidation, the abnormal instability and reactivity of the pyrido[2,1-a]isoindole
通过前所未有的吡啶基介导的无金属瓦克型氧化和酸介导的环化,从 2-吡啶基苯乙烯快速获得多种吡啶并[2,1- a ]异吲哚-5-鎓盐的两步法已经被开发。作为这种新型 Wacker 型氧化的机理研究的一部分,通过 DFT 计算研究了吡啶并[2,1- a ] 异吲哚中间体的异常不稳定性和反应性。