Metal-Free One-Pot Synthesis of (Tetrahydro)Quinolines through Three-Component Assembly of Arenediazonium Salts, Nitriles, and Styrenes
作者:So Won Youn、Huen Ji Yoo、Eun Mi Lee、Seo Young Lee
DOI:10.1002/adsc.201701451
日期:2018.1.17
achieved through a three‐component assembly reaction of arenediazonium salts, nitriles, and styrenes. In sharp contrast to the prior works with the same reagent blend, the formation of N‐arylnitrilium intermediates from arenediazonium salts and nitriles was followed by reaction with styrenes, leading to 3,4‐dihydroquinolinium salts as a common intermediate. These could be further transformed to quinolines
作者:Sara Martínez de Salinas、Jesús Sanjosé‐Orduna、Carlota Odena、Sergio Barranco、Jordi Benet‐Buchholz、Mónica H. Pérez‐Temprano
DOI:10.1002/anie.201916387
日期:2020.4.6
Herein, we disclose the synthesis of metallacyclic Cp*CoIII complexescontaining weakly chelating functional groups. We have employed these compounds not only as an exceptional platform for accessing some of the most widely invoked transient intermediates in C-H functionalization processes but also as competent catalysts in different Cp*Co-catalyzed transformations, including a benchmark coupling reaction
Synthesis of Functionalized Quinolines through a Reaction of Amides and Alkynes Promoted by Triflic Anhydride/Pyridine
作者:Lian-Hua Li、Zhi-Jie Niu、Yong-Min Liang
DOI:10.1002/chem.201703832
日期:2017.11.2
A concise, novel and flexible metal‐free single step to synthesize functionalized quinolines is reported. Triflic anhydride‐mediated (Tf2O) activation of amides is discussed in the presence of pyridine to offer strong electrophiles, thereby showcasing excellent productivity, high regio‐ and chemoselectivity, and widely tolerable substrates. This approach provides a straightforward and efficient way
Indole Synthesis via Cobalt(III)-Catalyzed Oxidative Coupling of <i>N</i>-Arylureas and Internal Alkynes
作者:Zhuo-Zhuo Zhang、Bin Liu、Jing-Wen Xu、Sheng-Yi Yan、Bing-Feng Shi
DOI:10.1021/acs.orglett.6b00494
日期:2016.4.15
A mild Co(III)-catalyzed oxidative annulation of N-arylureas and internal alkynes has been developed. The use of less electrophilic ureas other than acetamides as directing groups is crucial for the reaction. A broad range of synthetically useful functional groups are compatible with this reaction, thus providing a new opportunity for the synthesis of diverse indoles.
Synthesis of Quinolines through Three-Component Cascade Annulation of Aryl Diazonium Salts, Nitriles, and Alkynes
作者:Hao Wang、Qian Xu、Sheng Shen、Shouyun Yu
DOI:10.1021/acs.joc.6b02509
日期:2017.1.6
An efficient and rapid synthesis of multiply substituted quinolines is described. This method is enabled by a three-component cascade annulation of readily available aryl diazonium salts, nitriles, and alkynes. This reaction is catalyst- and additive-free. Various aryl diazonium salts, nitriles, and alkynes can participate in this transformation, and the yields are up to 83%.