Logic design and synthesis of quinoxalines via the integration of iodination/oxidation/cyclization sequences from ketones and 1,2-diamines
作者:Mi Lian、Qi Li、Yanping Zhu、Guodong Yin、Anxin Wu
DOI:10.1016/j.tet.2012.09.056
日期:2012.11
A novel protocol for the synthesis of quinoxalines has been developed from simple ketones and 1,2-diamines. This process underwent a logic approach to bis-substituted quinoxalines via a consecutive iodination/Kornblum oxidation/cyclization in the presence of I2/CuO/DMSO and to mono-substituted quinoxalines via an iodination/cyclization/aromatization in the presence of I2/CuO/K3PO4·3H2O.
从简单的酮和1,2-二胺开发了一种新颖的喹喔啉合成方案。此过程通过连续碘化经历了一个逻辑方式双-取代的喹喔啉/ kornblum氧化反应/环化在我的存在2 /的CuO / DMSO中,并通过以单取代的喹喔啉碘化/环化/芳构化中的我的存在2 /的CuO / K 3 PO 4 ·3H 2 O.
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).
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
The effective Cp*IrIII‐catalyzed [4+2] tandem cyclization reaction of β‐keto sulfoxonium ylides and o ‐phenylenediamine has been reported for the first time, furnishing monosubstituted quinoxaline and its derivatives with moderate to excellent yield. This novel protocol exhibits broad substrate scope as well as feasibility for late‐stage modification of drug molecules
首次报道了有效的Cp * Ir III催化β-酮基硫代氧鎓基化物和邻苯二胺的串联[4 + 2]环化反应,提供了中等至优异收率的单取代喹喔啉及其衍生物。该新方案展示了广泛的底物范围以及药物分子后期修饰的可行性