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。
[EN] METHODS AND INTERMEDIATES FOR THE PREPARATION OF MACROLACTAMS<br/>[FR] PROCÉDÉS ET INTERMÉDIAIRES POUR LA PRÉPARATION DE MACROLACTAMES
申请人:MERCK SHARP & DOHME
公开号:WO2015095430A1
公开(公告)日:2015-06-25
The present invention relates to synthetic processes useful in the preparation of macrolactams that inhibit hepatitis C virus (HCV), specifically macrolactam compounds that inhibit the HCV NS3 protease activity and have application in the treatment of conditions caused by HCV. The present invention also encompasses intermediates useful in the disclosed synthetic processes and the methods of their preparation.
A theoretical investigation of enhancement of mass transfer from a packed bed using acoustic oscillations
作者:Raman I. Sujith、Ben T. Zinn
DOI:10.1002/cjce.5450780616
日期:2000.12
describes a theoreticalinvestigation of the possibility of improving the performance of packedbed dryers usingacousticoscillations. It was motivated by the increasing interest in the use of acousticoscillations to improve the performance of energy-intensive, industrial processes. Sound propagation in a packedbed was modelled as propagation through a porous medium. The effect of acoustic oscillations
本文描述了使用声学振荡提高填充床干燥器性能的可能性的理论研究。它的动机是人们对使用声学振荡来提高能源密集型工业过程的性能越来越感兴趣。填充床中的声音传播被模拟为通过多孔介质的传播。然后通过数值积分传热和传质方程来研究声振荡对干燥速率的影响。该模型使用准稳态相关性进行传热和传质。结果表明存在空隙率和声压级的阈值,超过该阈值可以获得干燥速率的显着增加。传质的增加随着有效粒径而减小。关于 decrit dans cet 文章 une etude theorique sur la possibilite d'arneliorer la performance de sechoirs a lits garnis par des 振荡声学。Cette etude estmotivee par l'interět grandissant pour les 振荡 acoustiques en vue d'ameliorer
Phosphine free Mn-complex catalysed dehydrogenative C–C and C–heteroatom bond formation: a sustainable approach to synthesize quinoxaline, pyrazine, benzothiazole and quinoline derivatives
作者:Kalicharan Das、Avijit Mondal、Dipankar Srimani
DOI:10.1039/c8cc05877f
日期:——
Herein the first sustainable synthesis of quinoxalines, pyrazines and benzothiazoles catalysed by a phosphine free Mn(I) complex via acceptorless dehydrogenative coupling (ADC) is reported. This method is also applied successfully to synthesize quinolines via the dehydrogenation (removal of H2) and condensation (removal of H2O) reaction between 2-aminobenzyl alcohols and secondary alcohols.
Asymmetric Hydrogenation of 2- and 2,3-Substituted Quinoxalines with Chiral Cationic Ruthenium Diamine Catalysts
作者:Jie Qin、Fei Chen、Ziyuan Ding、Yan-Mei He、Lijin Xu、Qing-Hua Fan
DOI:10.1021/ol2029096
日期:2011.12.16
The enantioselective hydrogenation of 2-alkyl- and 2-aryl-subsituted quinoxalines and 2,3-disubstituted quinoxalines was developed by using the cationic Ru(η6-cymene)(monosulfonylated diamine)(BArF) system in high yields with up to 99% ee. The counteranion was found to be critically important for the high enantioselectivity and/or diastereoselectivity.