通过铜催化串联环化反应由一嗪和苄基亚甲基丙二醛一锅合成[1,2,4] Triazolo [1,5- a ]吡啶
摘要:
已经发现了一种简单有效的铜催化串联自由基环化反应,用于从易于获得的嗪和苄叉亚甲基腈合成三芳基[1,2,4]三唑并[1,5- a ]吡啶。新的转化涉及多个C H / C C键断裂和C C / C N键形成,以及气态氢和甲烷的挤出。可以将具有不同官能团的多种底物以良好的产率转化为相应的产物。稠合的杂环具有强烈的蓝色荧光,具有大的笔划位移和高的量子产率。
通过铜催化串联环化反应由一嗪和苄基亚甲基丙二醛一锅合成[1,2,4] Triazolo [1,5- a ]吡啶
摘要:
已经发现了一种简单有效的铜催化串联自由基环化反应,用于从易于获得的嗪和苄叉亚甲基腈合成三芳基[1,2,4]三唑并[1,5- a ]吡啶。新的转化涉及多个C H / C C键断裂和C C / C N键形成,以及气态氢和甲烷的挤出。可以将具有不同官能团的多种底物以良好的产率转化为相应的产物。稠合的杂环具有强烈的蓝色荧光,具有大的笔划位移和高的量子产率。
Ring and side chain formylated pyrazoles from acetophenone azines and Vilsmeier's reagent
作者:Ramaiyan Manikannan、Shanmugam Muthusubramanian
DOI:10.1002/jhet.576
日期:2011.5
Differently substituted acetophenoneazines on treatment with excess phosphorous oxychloride in N,N‐dimethylformamide have found to yield three products in each case. An acceptable mechanism has been suggested for the formation of all the three products. J. Heterocyclic Chem., (2011).
Rhodium(III)-catalyzed coupling of aromatic ketazines or oximes with 2-vinyloxirane via C–H activation
作者:Jing Wen、An Wu、Yuqin Miao、Jin Zhu
DOI:10.1016/j.tetlet.2015.08.025
日期:2015.10
Described herein is a rhodium(III)-catalyzed coupling of aromatic ketazines or oximes with 2-vinyloxirane via directed C-H activation. This reaction proceeds efficiently under mild conditions with a low catalyst loading, especially in conditions with room temperature in the absence of additives for aromatic ketazines. A wide range of substituted substrates is supported and a possible mechanism is proposed according to the experimental results of kinetic isotopic effect, reversibility studies, and catalysis with rhodacycle intermediate c1. (C) 2015 Elsevier Ltd. All rights reserved.
One-pot synthesis of [1,2,4]Triazolo[1,5-a]pyridines from azines and benzylidenemalononitriles via copper-catalyzed tandem cyclization
作者:Jianguang Lv、Zhiqing He、Jianmin Zhang、Yuwei Guo、Ziwei Han、Xinhua Bao
DOI:10.1016/j.tet.2018.06.002
日期:2018.7
A simple and efficient copper-catalyzedtandem radical cyclization reaction has been discovered for the synthesis of triaryl [1,2,4]triazolo[1,5-a]pyridines from easily accessible azines and benzylidenmalononitriles. The new transformation involves multiple CH/CC bonds cleavage and CC/CN bonds formation, with extrusion of gaseous hydrogen and methane. A wide variety of substrates with different functional
已经发现了一种简单有效的铜催化串联自由基环化反应,用于从易于获得的嗪和苄叉亚甲基腈合成三芳基[1,2,4]三唑并[1,5- a ]吡啶。新的转化涉及多个C H / C C键断裂和C C / C N键形成,以及气态氢和甲烷的挤出。可以将具有不同官能团的多种底物以良好的产率转化为相应的产物。稠合的杂环具有强烈的蓝色荧光,具有大的笔划位移和高的量子产率。