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).
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
Cobalt-Catalyzed Effective Access to Quinoxalines with Insights in Annulation of Terminal Alkynes and <i>o</i>-Phenylenediamines
demonstrated by its gram-scale and broad potential applications. Furthermore, this protocol serves as a powerful tool for the late-stage functionalization of various complex bioactive molecules and drugs to provide a new class of molecules containing two distinct bioactive molecules directly linked. Detailed mechanistic studies reveal that the current reaction goes through a novel mechanism different from
Facile synthesis of quinoxaline catalyzed by iron-based carbon material in water
作者:Fuying Zhu、Yamei Lin
DOI:10.1016/j.tet.2023.133752
日期:2024.1
achieve the efficient synthesis of quinoxaline (16 examples, 82–91 % yield) with water as a solvent and without additional bases. Moreover, the industrial application potential of Fe20/NC-Mg is demonstrated by gram-level synthesis and reusability of catalysts after four cycles. This protocol has high atomic and step economy, which meets with the requirement of green synthesis.