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。
of acetophenones with o-phenylenediamines and sulfur in DMSO in the presence of piperidine as a catalyst. The products could be readily isolated from the reaction mixture by simple precipitation and washing with methanol. This set of reaction conditions applied to higher homologs of acetophenones as well as benzyl phenyl ketones led to 2,3-di-C-substituted quinoxalines. Further functionalization of
Stereodivergent asymmetric hydrogenation of quinoxalines
作者:Chenguang Liu、Xufang Liu、Qiang Liu
DOI:10.1016/j.chempr.2023.05.006
日期:2023.9
products, preferably using a catalytic method, is of great interest and importance in both organic synthesis and drug discovery. Herein, we report an unprecedented stereodivergent AH of di-substituted quinoxalines via Mn catalysis, furnishing cis- and rarely accessed trans-chiral tetrahydroquinoxalines (THQs) with high levels of diastereo- and enantioselectivity. This transformation features excellent functional
Ketones as a new synthon for quinoxaline synthesis
作者:Chan Sik Cho、Wen Xiu Ren、Sang Chul Shim
DOI:10.1016/j.tetlet.2007.05.044
日期:2007.7
o-Phenylenediamines react with an array of ketones in PEG-400 at 60 degrees C under an atmosphere of air in the presence of KOH to afford the corresponding quinoxalines in good yields. (c) 2007 Elsevier Ltd. All rights reserved.