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
The First General, Efficient and Highly Enantioselective Reduction of Quinoxalines and Quinoxalinones
作者:Magnus Rueping、Francisco Tato、Fenja. R. Schoepke
DOI:10.1002/chem.200902907
日期:——
Simple yet efficient: A series of diverse substituted tetrahydroquinoxalines and dihydroquinoxalinones have been synthesized for the first time in a highly enantioselective fashion (see scheme). Using this metal‐free hydrogenation it is possible to isolate these products, which are of high pharmaceutical interest, in good yields and with excellent enantioselectivities in a minimal number of reaction
A facile synthesis of quinoxalines by using SO<sub>4</sub><sup>2−</sup>/ZrO<sub>2</sub>-TiO<sub>2</sub> as an efficient and recyclable heterogeneous catalyst
作者:Sushil V. Shelke、Sambhaji T. Dhumal、Akshay Y. Karale、Tejshri R. Deshmukh、Meghshyam K. Patil
DOI:10.1080/00397911.2022.2039711
日期:2022.2.16
reaction of o-pheneylenediamine with substituted phenacyl bromides/benzil in the presence of SO42−/ZrO2-TiO2 as an efficient and heterogeneouscatalyst. The catalyst can be recovered up to five catalytic cycles without significant loss in catalytic activity. The reported SO42−/ZrO2-TiO2 catalyst has been thoroughly characterized by using infrared spectroscopy, differential scanning calorimetry (DSC), thermogravimetric
摘要 在作为高效多相催化剂的 SO 4 2- /ZrO 2 -TiO 2存在下,邻苯二胺与取代的苯酰溴/苄基的环缩合反应以良好至优异的产率合成了喹喔啉衍生物。该催化剂最多可回收五个催化循环,而催化活性没有显着损失。报道的 SO 4 2- /ZrO 2 -TiO 2采用红外光谱、差示扫描量热法 (DSC)、热重分析 (TGA) 和粉末 X 射线衍射 (XRD) 对催化剂进行了全面表征。在这里,我们在这种环缩合反应中使用乙醇作为绿色溶剂。这种新方法具有收率高、反应时间短、无毒、催化剂易回收等优点。
A rapid synthesis of quinoxalines by using Al<sub>2</sub>O<sub>3</sub>–ZrO<sub>2</sub> as heterogeneous catalyst
作者:Premkumar B. Thombre、Sonali A. Korde、Sudarshan S. Dipake、Anjali S. Rajbhoj、Machhindra K. Lande、Suresh T. Gaikwad
DOI:10.1080/00397911.2023.2239394
日期:2023.10.2
highly efficient and environmentally benign protocol for synthesizing biologically important quinoxaline derivatives. The synthesis involves the reaction of 1,2-diamines with substituted phenacyl bromides or benzil, taking place at roomtemperature in N,N-dimethylformamide (DMF) solvent. The reaction is facilitated by a bifunctional heterogeneous catalyst composed of Al2O3–ZrO2 binary metal oxide.
摘要 在这项研究中,我们提出了一种高效且环境友好的方案来合成具有生物学意义的喹喔啉衍生物。该合成涉及 1,2-二胺与取代的苯甲酰溴或苯偶酰的反应,该反应在室温下在N,N-二甲基甲酰胺 (DMF) 溶剂中进行。由 Al 2 O 3 –ZrO 2组成的双功能多相催化剂促进了该反应二元金属氧化物。我们的方法具有许多优点,包括优异的产品收率、可再生的催化条件、最少的催化剂用量、更安全的化学反应、短的反应时间和简单的后处理程序。为了确定合成衍生物的化学结构,我们采用了核磁共振(NMR)和高分辨率质谱(HRMS)等表征技术。此外,还使用X射线衍射(XRD)、能量色散X射线扫描电子显微镜(SEM-EDAX)和热重分析(TGA)对Al 2 O 3 -ZrO 2催化剂进行了表征。