Iron-Catalyzed Cyclization of Nitrones with Geminal-Substituted Vinyl Acetates: A Direct [4 + 2] Assembly Strategy Leading to 2,4-Disubstituted Quinolines
作者:Mingbing Zhong、Song Sun、Jiang Cheng、Ying Shao
DOI:10.1021/acs.joc.6b01910
日期:2016.11.18
An iron-catalyzed intermolecular [4 + 2] cyclization of arylnitrones with geminal-substituted vinyl acetates was developed for the synthesis of 2,4-disubstituted quinolines in moderate to good yields with good functional group compatibilities. Preliminary mechanistic studies suggest a plausible iron-catalyzed C–H activation process under external-oxidant-free conditions.
Simple and Clean Photo-induced Methylation of Heteroarenes with MeOH
作者:Wenbo Liu、Xiaobo Yang、Zhong-Zhen Zhou、Chao-Jun Li
DOI:10.1016/j.chempr.2017.03.009
日期:2017.5
Heteroarene methylation utilizing a cheap and safe methylation source without involving transition metals represents an important yet challenging objective. Here, a simple and clean catalyst-free protocol for the methylation of various heteroarenes (including six- and five-membered types) is described under light irradiation. This protocol employs cheap, readily available, and abundant MeOH as both
KMnO 4 -mediated direct selective radical cross-coupling: An effective strategy for C2 arylation of quinoline N -oxide with arylboronic acids
作者:Jin-Wei Yuan、Ling-Bo Qu
DOI:10.1016/j.cclet.2017.01.016
日期:2017.5
arylboronic acids is achieved using KMnO4 as the sole and efficient oxidative system. This method provides an efficient protocol to construct regioselectively 2-arylquinoline N-oxides via radical cross-coupling reaction in moderated to good yields under mild conditions.
Cu(ii)-promoted three-component coupling sequence for the efficient synthesis of substituted quinolines
作者:Fuhong Xiao、Wen Chen、Yunfeng Liao、Guo-Jun Deng
DOI:10.1039/c2ob26484f
日期:——
The copper-promoted three-componentcouplingsequence for substituted quinoline formation from aldehydes, anilines and acetone is described. Various 2-arylquinolines were selectively obtained in good yields under mild conditions. The reaction tolerated a wide range of functionalities.
Direct, Catalytic, and Regioselective Synthesis of 2-Alkyl-, Aryl-, and Alkenyl-Substituted <i>N</i>-Heterocycles from <i>N</i>-Oxides
作者:Oleg V. Larionov、David Stephens、Adelphe Mfuh、Gabriel Chavez
DOI:10.1021/ol403631k
日期:2014.2.7
A one-step transformation of heterocyclic N-oxides to 2-alkyl-, aryl-, and alkenyl-substituted N-heterocycles is described. The success of this broad-scope methodology hinges on the combination of copper catalysis and activation by lithium fluoride or magnesium chloride. The utility of this method for the late-stage modification of complex N-heterocycles is exemplified by facile syntheses of new structural