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。
Cp*Co(III)-catalyzed C H amidation of azines with dioxazolones
作者:Yanzhen Huang、Chao Pi、Zhen Tang、Yangjie Wu、Xiuling Cui
DOI:10.1016/j.cclet.2020.08.046
日期:2020.12
Abstract Cp*Co(III)-catalyzed direct C H amidation of azines has been developed. This conversion could proceed smoothly in the absence of external oxidants, acids or bases, with excellent regioselectivity and broad functional group tolerance. CO2 was released as the sole byproduct, thus providing an environmentally benign amidation process. The products obtained are important intermediates in organic
Evaluation of the Extent of Conjugation in Symmetrical and Asymmetrical Aryl-Substituted Acetophenone Azines Using Electrochemical Methods
作者:Vittorio A. Sauro、Mark S. Workentin
DOI:10.1021/jo0056287
日期:2001.2.1
all cases, the formation of the radicalanion is completely reversible and the standard reduction potentials, Eo1-X/Y/1-X/Y.- could be determined. The reversibility of the second electron transfer is substituent dependent with certain dianions sufficiently basic to be protonated under our conditions. Standard reduction potentials (Eo1-X/Y/1-X/Y.-) for the formation of radicalanions exhibit a large
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).
Rh-Catalyzed Regioselective <i>ortho</i>-C–H Carbenoid Insertion of Diarylazines
作者:Yunliang Yu、Changsheng Kuai、Remi Chauvin、Nian Tian、Shuangshuang Ma、Xiuling Cui
DOI:10.1021/acs.joc.7b01472
日期:2017.8.18
The Rh-catalyzed ortho-C–H carbenoidinsertion reaction of diarylazines with diazo compounds has been developed. A wide range of ortho-substituted diarylazines have been obtained in moderate to high yields with high regioselectivity at room temperature. The hydrolysis of the products could release ketones or aldehydes, giving access to aromatic 1,5-keto-diesters as valuable synthons for further chemical
Cp*Co(<scp>iii</scp>)-catalyzed annulation of azines by C–H/N–N bond activation for the synthesis of isoquinolines
作者:Dewal S. Deshmukh、Prashant A. Yadav、Bhalchandra M. Bhanage
DOI:10.1039/c9ob00174c
日期:——
and external oxidant free approach has been disclosed for the synthesis of isoquinolines. Azines were employed for annulation reactions with alkynes via sequential C–H/N–N bond activation using an air-stable cobalt catalyst. The method takes advantage of the incorporation of both the nitrogen atoms of azines into the desired isoquinoline products, offering the highest atom economy. In addition, the