A copper-catalyzed cycloamination of α-Csp3–H bond of N-aryl ketimines with sodium azide has been developed. This methodology provides an efficient access to quinoxalines and features mild reaction conditions and readily available ketimines with diverse functional group tolerance.
One-step approach for the synthesis of functionalized quinoxalines mediated by T3P®–DMSO or T3P® via a tandem oxidation–condensation or condensation reaction
作者:Kachigere B. Harsha、Kanchugarkoppal S. Rangappa
DOI:10.1039/c6ra03078e
日期:——
An easy and efficient propylphosphonic anhydride (T3P®)–DMSO or T3P® mediated oxidation–condensation or condensationreaction for the synthesis of quinoxalines derived from the interaction of different arrays of condensing partners with ortho-phenylene diamines (o-PDs) under simple and mild reaction conditions in one step has been reported for the first time.
Silica supported dodecatungstophosphoric acid (DTP/SiO<sub>2</sub>): An efficient and recyclable heterogeneous catalyst for rapid synthesis of quinoxalines
作者:Madhav J. Hebade、Tejshri R. Deshmukh、Sambhaji T. Dhumal
DOI:10.1080/00397911.2021.1939060
日期:2021.8.18
Abstract A facile synthesis of quinoxalines by the cyclocondensation of substituted phenacyl bromides with o-pheneylenediamines using silica-supported dodecatungstophosphoric acid (DTP/SiO2) as a recyclableheterogeneouscatalyst is unveiled in this research work. This method is practicable due to environmentally benign, easy workup, high yield, less reaction time, low cost, mild reaction condition
Palladium-Catalyzed Chelation-Assisted Aromatic C–H Nitration: Regiospecific Synthesis of Nitroarenes Free from the Effect of the Orientation Rules
作者:Wei Zhang、Shaojie Lou、Yunkui Liu、Zhenyuan Xu
DOI:10.1021/jo400594j
日期:2013.6.21
ortho-nitration of aryl C–H bond is described. A range of azaarenes such as 2-arylquinoxalines, pyridines, quinoline, and pyrazoles were nitrated with excellent chemo- and regioselectivity. Using the O-methyl oximyl group as a removable directing group, the regiospecific synthesis of a variety of o-nitro aryl ketones was achieved starting from aryl ketones via a three-step process involving the Pd-catalyzed
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.