Direct synthesis of N-heterocycles via the acceptorless dehydrogenative coupling is very challenging and scarcely reported under 3d transition-metal catalysis. Here, we have developed an efficient Mn(I)-catalyzed sustainable synthesis of various quinoxalines from 1,2-diaminobenzenes and 1,2-diols via the acceptorless dehydrogenative coupling reaction. Further, this strategy was successfully applied
C-N Bond Formation Catalyzed by Ruthenium Nanoparticles Supported on N-Doped Carbon via Acceptorless Dehydrogenation to Secondary Amines, Imines, Benzimidazoles and Quinoxalines
作者:Bin Guo、Hong-Xi Li、Shi-Qi Zhang、David James Young、Jian-Ping Lang
DOI:10.1002/cctc.201801525
日期:2018.12.21
Ruthenium nanoparticles (NPs) supported on N‐doped carbon (Ru/N−C) were prepared by the pyrolysis of cis‐Ru(phen)2Cl2 loaded onto carbon powder (VULCAN XC72R) at 800 °C. Ru/N−C NPs (0.2 mol% Ru) selectively catalyzed either acceptorless dehydrogenation coupling (ADC) or auto‐transfer‐hydrogen (ATH) reactions of amines with alcohols to imines and secondary amines. Such selectivity could be controlled
Hydrogen Auto‐transfer Synthesis of Quinoxalines from
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‐Nitroanilines and Biomass‐based Diols Catalyzed by MOF‐derived N,P Co‐doped Cobalt Catalysts
作者:Kangkang Sun、Dandan Li、Guo‐Ping Lu、Chun Cai
DOI:10.1002/cctc.202001362
日期:2021.1.12
A Co‐based heterogeneous catalyst supported on N,P co‐doped porous carbon (Co@NCP) is prepared via a facile in‐situ doping‐carbonization method. The Co@NCP composite features a large surface area, high pore volume, high‐density and strong basic sites. Furthermore, doping of P atoms can regulate the electronic density of Co. Therefore, Co@NCP exhibits good performance for the synthesis of quinoxalines
The Synthesis of Benzimidazoles and Quinoxalines from Aromatic Diamines and Alcohols by Iridium-Catalyzed Acceptorless Dehydrogenative Alkylation
作者:Toni Hille、Torsten Irrgang、Rhett Kempe
DOI:10.1002/chem.201400400
日期:2014.5.5
N‐heteroaromatics with many applications in pharmaceutical and chemical industry. Here, the synthesis of both classes of compounds starting from aromatic diamines and alcohols (benzimidazoles) or diols (quinoxalines) is reported. The reactions proceed through acceptorless dehydrogenative condensation steps. Water and two equivalents of hydrogen are liberated in the course of the reactions. An Ir complex stabilized
苯并咪唑和喹喔啉是重要的N-杂芳族化合物,在制药和化学工业中有许多应用。在此,报道了从芳族二胺和醇(苯并咪唑)或二醇(喹喔啉)开始的两类化合物的合成。反应通过无受体的脱氢缩合步骤进行。在反应过程中释放出水和两当量的氢。由三齿P ^ N ^ P配体N 2,N 6-双(二异丙基膦基)吡啶-2,6-二胺稳定的Ir配合物显示出两个反应的最高催化活性。
Gold-Catalyzed Synthesis of Glyoxals by Oxidation of Terminal Alkynes: One-Pot Synthesis of Quinoxalines
作者:Shuai Shi、Tao Wang、Weibo Yang、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/chem.201300518
日期:2013.5.17
From terminalalkynes to glyoxals: Terminalalkynes can be oxidized under mild conditions by the use of an N‐oxide in the presence of a gold catalyst. The intermediate glyoxal derivatives can be transferred in a one‐pot procedure to substituted quinoxalines (see scheme).