Chinese Journal of Organic Chemistry ›› 2023, Vol. 43 ›› Issue (8): 2885-2894.DOI: 10.6023/cjoc202301007 Previous Articles     Next Articles


张晓雨, 李欣燕, 崔冰, 邵志晖*(), 赵铭钦*()   

  1. 河南农业大学烟草学院 郑州 450002
  • 收稿日期:2023-01-08 修回日期:2023-03-19 发布日期:2023-04-13
  • 基金资助:
    河南农业大学拔尖人才(30501028); 河南省自然科学基金(232300420376)

Design, Synthesis and Antioxidant Activity of Tetrahydro-β-carbolines

Xiaoyu Zhang, Xinyan Li, Bing Cui, Zhihui Shao(), Mingqin Zhao()   

  1. College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002
  • Received:2023-01-08 Revised:2023-03-19 Published:2023-04-13
  • Contact: *E-mail:;
  • Supported by:
    The Top-Notch Personnel Program of Henan Agricultural University(30501028); The Natural Science Foundation of Henan Province(232300420376)

Tetrahydro-β-carbolines (THBCs) are important structural units of indole alkaloids, most of which have significant biological properties, such as anti-inflammatory, antiviral, anticancer, antibacterial, and antioxidant properties. Herein, a Pictet-Spengler oxidation reaction with 3-(2-methylaminoethyl) indole and alcohols as starting materials was developed over the pincer manganese catalyst. The reaction system showed good substrate applicability, 12 kinds of THBC products were synthesized from aromatic alcohols and aliphatic alcohols with the yields of 43%~99%. The structures of the products were confirmed and characterized by 1H NMR, 13C NMR, IR and HRMS. The antioxidant activity of these compounds were investigated by scavenging ABTS• and DPPH•. The results showed that in the two test systems, all of those compounds had good free radical scavenging ability, indicating that those compounds are a class of potential antioxidant. Among them, 1-(4-fluoro- phenyl)-2-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (3c), 2-methyl-1-(naphthalen-2-yl)-2,3,4,9-tetrahydro-1H-pyrido- [3,4-b]indole (3e), 2-methyl-1-propyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole(3h), 2-methyl-1-propyl-2,3,4,9-tetrahydro- 1H-pyrido[3,4-b]indole (3j) and 2-methyl-1-(2-(pyridin-3-yl)ethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (3l) showed the best effect on scavenging ABTS•, while 1-cyclohexyl-2-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (3i) and 2-methyl- 1-(2-(thiophen-2-yl)ethyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (3k) were slightly weaker, followed by 2-methyl-1-phe- nyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (3a), 2-methyl-1-(4-(methylthio)phenyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]- indole (3b), 1-(furan-2-yl)-2-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (3d), 2-methyl-1-(pyridin-3-yl)-2,3,4,9- tetrahydro-1H-pyrido[3,4-b]indole (3f) and 2-methyl-1-(thiophen-2-yl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (3g), and IC50 could reach 0.073 mg•mL-1 or above. Among of the target compounds, 3a, 3c, 3e and 3h had the best effect on scavenging DPPH•, followed by 3d, 3i, 3j and 3l, and 3b, 3f and 3g had the worst effect. In conclusion, compounds 3c, 3e and 3h had good scavenging ability on ABTS• and DPPH•, while compounds 3b, 3f and 3g had poor scavenging ability on 2,2'-azino- bis(3-ethylbenzothiazoline-6-sulfonate) cationic radical (ABTS•) and 1,1-diphenyl-2-picrylhydrazyl free radical (DPPH•).

Key words: tetrahydro-β-carbolines, manganese catalysis, alcohols, Pictet-Spengler reaction, antioxidation