Chinese Journal of Organic Chemistry ›› 2023, Vol. 43 ›› Issue (7): 2528-2542.DOI: 10.6023/cjoc202210036 Previous Articles     Next Articles

ARTICLES

取代8-羟基喹啉钌络合物催化Friedländer反应合成喹啉衍生物

朱玥a, 陈璐a, 赵静a, 孙庆荣a, 杨维清a, 付海燕b, 马梦林a,*()   

  1. a西华大学理学院 四川省不对称合成与手性技术重点实验室 成都 610039
    b四川大学化学学院 绿色化学与技术教育部重点实验室 成都 610064
  • 收稿日期:2022-10-28 修回日期:2022-12-02 发布日期:2023-02-14
  • 通讯作者: 马梦林
  • 基金资助:
    国家自然科学基金(22072099); 教育部春晖计划基金(192635)

Synthesis of Quinoline Derivatives by Friedländer Reaction Catalyzed by Ruthenium Complexes of Substituted 8-Hydroxyquinoline

Yue Zhua, Lu Chena, Jing Zhaoa, Qingrong Suna, Weiqing Yanga, Haiyan Fub, Menglin Maa()   

  1. aKey Laboratory of Asymmetric Synthesis and Chiral Technology of Sichuan Province, School of Science, Xihua University, Chengdu 610039
    bKey Laboratory of Green Chemistry & Technology, Ministry of Education, Faculty of Chemistry, Sichuan University, Chengdu 610064
  • Received:2022-10-28 Revised:2022-12-02 Published:2023-02-14
  • Contact: Menglin Ma
  • Supported by:
    National Natural Science Foundation of China(22072099); Chunhui Program of Ministry of Education(192635)

The Friedländer quinoline synthesis method is a reaction of o-aminoaryl aldehyde or ketone with methyl ketone to obtain quinoline. In this paper, a method for synthesizing quinoline catalyzed by ruthenium complexes of quinoline was reported. Using 8-hydroxyquinoline ruthenium complex as catalyst, the reaction conditions were optimized. The effects of different substituents of 8-hydroxyquinoline ruthenium complexes on the reaction yield were comparatively studied. Among them, 5-methyl-8-hydroxyquinoline (1e) ruthenium complex catalyzed the synthesis of 2-phenylquinoline from o-aminobenzyl alcohol and acetophenone with the highest yield of 73%. The relationship between ligand structure and catalytic performance was discussed by combining IR, UV and density functional theory (DFT) calculations. A possible mechanism was proposed, which included the formation of aldehyde transition state through β-H elimination, cross aldol reaction, imination cyclization and finally dehydration to produce the target product. Using (1e)3Ru as catalyst, 32 quinoline derivatives with different substitutions were synthesized with 69%~94% yields under the optimized reaction conditions, which confirmed the generality of this method.

Key words: ruthenium complexes of 8-hydroxyquinoline, catalysis, Friedländer reaction