高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (10): 2239.doi: 10.7503/cjcu20200333

• 研究论文 • 上一篇    下一篇

环化及亚胺/酰胺部分氢化一锅法串联反应合成1,2,3,4⁃四氢喹喔啉

潘一骁1, 李艳稳1, 韩佳宏1, 赵浩强1, 冯宇2, 丁相元1, 徐立进1, 范青华2, 时茜3   

  1. 1.中国人民大学化学系, 北京 100872
    2.中国科学院化学研究所, 北京 100190
    3.温州大学化学与材料工程学院, 温州 325035
  • 收稿日期:2020-06-08 出版日期:2020-10-10 发布日期:2020-10-08
  • 基金资助:
    国家自然科学基金(21372258)

Synthesis of 1,2,3,4-Tetrahydroquinoxalines Through a One-pot Tandem Reaction Involving Cyclization and Hydrogenation of Imine and Amide Moieties

PAN Yixiao1, LI Yanwen1, HAN Jiahong1, ZHAO Haoqiang1, FENG Yu2, DING Xiangyuan1, XU Lijin1(), FAN Qinghua2(), SHI Qian3   

  1. 1.Department of Chemistry,Renmin University of China,Beijing 100872,China
    2.Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China
    3.College of Chemistry and Materials Engineering,Wenzhou University,Wenzhou 325035,China
  • Received:2020-06-08 Online:2020-10-10 Published:2020-10-08
  • Contact: XU Lijin,FAN Qinghua E-mail:20050062@ruc.edu.cn;fanqh@iccas.ac.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(No. 21772238) and the Science and Technology Program of Guangzhou City, China(Nos. 201510010080, 201604016037).

摘要:

报道了一种利用价廉易得的邻苯二胺衍生物与α-酮酸酯经环化/钌催化的亚胺和酰胺氢化串联反应一锅法制备1,2,3,4-四氢喹喔啉的方法. 该方法使用原位生成的Ru(acac)3/Triphos配合物和HBF4共催化剂组成的催化体系, 高效制备了一系列2-取代的1,2,3,4-四氢喹喔啉, 官能团耐受性良好. 在较低的氢气压力和不使用助催化剂的条件下, 反应可停留在只生成3,4-二氢喹喔啉酮产物阶段. 反应机理研究表明, 钌催化剂仅用于还原亚胺和酰胺部分, 而布朗斯台德酸助催化剂的选择对于酰胺部分去氧氢化至关重要. 研究表明, 布朗斯台德酸助催化剂通过活化酰胺部分参与催化过程.

关键词: 四氢喹喔啉, 环化, 亚胺, 酰胺, 氢化

Abstract:

Efficient synthesis of 1,2,3,4-tetrahydroquinoxalines from readily available 1,2-diaminobenzenes and α-ketoesters via a one-pot tandem process that combines cyclization and Ru-catalyzed hydrogenation of imine and amide moieties is reported. Using the catalyst consisting of in situ generated ruthenium/triphos complex and HBF4 co-catalyst, a range of structurally diverse 2-substituted 1,2,3,4-tetrahydroquinoxalines were prepared in good to excellent yields, and various functional groups including those are reduction-sensitive were well tolerated. The reaction could stop at 3,4-dihydroquinoxalin-2(1H)-one stage under a lower hydrogen pressure in the absence of any co-catalyst. Mechanistic studies revealed that the ruthenium catalyst works exclusively for the reduction of imine and amide moieties, and the choice of a Bronsted acid co-catalyst is crucial to the successful deoxygenative hydrogenation of amide moiety. It is believed that the activation of the amide moiety with the Bronsted acid co-catalyst is involved in the catalytic process.

Key words: Tetrahydroquinoxaline, Cyclization, Imine, Amide, Hydrogenation

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