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
We have designed a general, inexpensive, and versatile method for the synthesis of (1H-benzo[d]imidazol-2-yl)(phenyl)methanone and the formation of C–N bonds via an aromaticaldehyde and o-phenylenediamine. In the presence of N,N-dimethylformamide/sulfur, (1H-benzo[d]imidazol-2-yl)(phenyl)methanone was obtained; however, in the absence of sulfur, quinoxaline was obtained in 1,4-dioxane. A wide range
我们设计了一种通用,廉价且通用的方法,用于合成(1 H-苯并[ d ]咪唑-2-基)(苯基)甲酮并通过芳香醛和邻苯二胺形成C–N键。在N,N-二甲基甲酰胺/硫的存在下,得到(1H-苯并[ d ]咪唑-2-基)(苯基)甲酮。然而,在不存在硫的情况下,在1,4-二恶烷中获得了喹喔啉。在温和的条件下获得了广泛的喹喔啉和(1 H-苯并[ d ]咪唑-2-基)(苯基)亚甲酮。
A heterogeneous catalytic strategy for facile production of benzimidazoles and quinoxalines from primary amines using the Al-MCM-41 catalyst
This study reports a straightforward heterogeneous catalytic (Al-MCM-41) approach to synthesize nitrogen heterocycle moieties from primaryamines under solvent-free conditions. The Al-MCM-41 catalyst was prepared using a hydrothermal method and characterized by various analytical techniques. The probability and limitations of the catalytic methodology were presented with various substrates. The catalytic
A transition metal-free synthesis of 2-arylquinoxaline is achieved by using arylhydrazine salt as an aryl radical arylation reagent and air as an oxidant in the presence of K2CO3. This protocol features metal-free, no additives, mild reaction conditions, environment friendly, and can be used to construct biologically active molecules containing 2-phenylquinoxaline structure.
在 K 2 CO 3存在下,使用芳基肼盐作为芳基自由基芳基化试剂,空气作为氧化剂,实现了 2-芳基喹喔啉的无过渡金属合成。该方案不含金属、无添加剂、反应条件温和、环境友好,可用于构建含有2-苯基喹喔啉结构的生物活性分子。
Iridium-Catalyzed Carbenoid Insertion of Sulfoxonium Ylides for Synthesis of Quinoxalines and β-Keto Thioethers in Water
This work demonstrates an effective and green synthetic strategy for the preparation of quinoxalines utilizing sulfoxoniumylides as safe carbene sources via a key N–H insertion. The method was also applied to S–Hinsertions for synthesis of β‐keto thioethers under mild and economical conditions. This strategy avoids the safety issues of diazo compounds and the use of organic solvents, which meets