A new facile, efficient synthesis and structure peculiarity of quinoxaline derivatives with two benzimidazole fragments
作者:Vakhid A. Mamedov、Nataliya A. Zhukova、Victor V. Syakaev、Aidar T. Gubaidullin、Tat'yana N. Beschastnova、Dil'bar I. Adgamova、Aida I. Samigullina、Shamil K. Latypov
DOI:10.1016/j.tet.2012.10.045
日期:2013.1
A highly efficient and versatile method for the synthesis of quinoxalinederivatives with two benzimidazole fragments have been developed on the basis of the ring contraction of 3-(benzimidazo-2-yl)quinoxalin-2(1H)-one with 1,2-diaminobenzene and its various types of substituted and condensed derivatives. Owing to the inter- and intramolecular processes, involving self association, proton exchange
基于3-(苯并咪唑-2-基)喹喔啉-2(1 H)-与1,2-的环收缩,已开发出一种高效且通用的具有两个苯并咪唑片段的喹喔啉衍生物的合成方法。二氨基苯及其各种类型的取代和稠合衍生物。由于分子间和分子内过程,涉及桥联和相邻碳原子的大多数双-苯并咪唑基喹喔啉信号的几种形式之间的自缔合,质子交换,构象和/或互变异构交换,且NMR光谱中的苯并咪唑片段变宽。苯并咪唑片段与分子的喹喔啉核心之间的共轭作用比喹喔啉衍生物(10c)与其噻二唑[ f ]-(17)和吡咯并[ a ]-(19)环化了衍生物,导致整个分子的平面度更大。
The synergistic effect of self-assembly and visible-light induced the oxidative C–H acylation of N-heterocyclic aromatic compounds with aldehydes
作者:Lingling Zhang、Guoting Zhang、Yongli Li、Shengchun Wang、Aiwen Lei
DOI:10.1039/c8cc02342e
日期:——
between two hydrocarbon compounds is regarded as a foundational issue in green chemistry. High atom-economy and mild conditions are long term pursued goals in this field. Herein, we developed a visible-light mediated direct cross-coupling between N-heterocycles and aldehydes without the requirement of a photocatalyst. Several N-heterocycles afforded the acylation products with aromatic or aliphatic aldehydes
Oxidant-Controlled C-sp<sup>2</sup>/sp<sup>3</sup>–H Cross-Dehydrogenative Coupling of N-Heterocycles with Benzylamines
作者:Rohit Sharma、Mohd Abdullaha、Sandip B. Bharate
DOI:10.1021/acs.joc.7b00856
日期:2017.9.15
cross-dehydrogenative coupling (CDC) of benzylamines with N-heterocycles having sp2 or sp3 carbon resulted in the formation of C-benzoylated or alkenylated products. Benzoylation of N-heterocycles occurs via (NH4)2S2O8 catalyzed benzoyl radical formation. An oxidative alkenylation of N-heterocycles having C-sp3 carbon (2-methylaza-arenes) occurs via deamination of benzylamine followed by C-sp3-H bond activation
苄基胺与具有sp 2或sp 3碳的N-杂环的氧化剂控制的离子液体介导的交叉脱氢偶联(CDC)导致C-苯甲酰化或烯基化产物的形成。N-杂环的苯甲酰化是通过(NH 4)2 S 2 O 8催化的苯甲酰基基团形成的。具有C-sp 3碳的N-杂环(2-甲基氮杂芳烃)的氧化烯基化反应是通过苄胺的脱氨基反应,然后以高立体选择性进行C-sp 3 -H键活化而进行的。苯甲酰化和烯基化方案均不含金属,绿色,简单,有效,并且可耐受多种官能团。
Regiospecific Benzoylation of Electron-Deficient <i>N</i>-Heterocycles with Methylbenzenes via a Minisci-Type Reaction
作者:Wajid Ali、Ahalya Behera、Srimanta Guin、Bhisma K. Patel
DOI:10.1021/acs.joc.5b00501
日期:2015.6.5
coupling between electron-deficient N-heterocycles (isoquinoline, quinolines, and quinoxalines) and methylbenzenes leading to regiospecific C–aroylation has been accomplished using AlCl3 as the catalyst in the presence of oxidant TBHP. This protocol is a practical alternative to the classical Minisci reaction.
Nickel-catalyzed electrochemical Minisci acylation of aromatic N-heterocycles with α-keto acids via ligand-to-metal electron transfer pathway
作者:Hang Ding、Kun Xu、Cheng-Chu Zeng
DOI:10.1016/j.jcat.2019.10.030
日期:2020.1
A nickel-catalyzed electrochemical methodology for the Minisci acylation of aromatic electron-deficient heterocycles with α-keto acids has been developed. The reaction is performed in an undivided cell under constant current conditions, featuring broad scope of substrates and avoiding the conventional utilization of silver-based catalysts in conjunction with excess amount of oxidants. Cyclic voltammetric