Synthesis
DOI: 10.1055/a-2746-2191
Paper

Amine-Facilitated Tandem Aerobic Oxidation and Cyclization to Tetrahydro-β-Carbolines

Authors

  • Yu-Ting Zhu

    1   College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, P. R. China (Ringgold ID: RIN47856)
  • Rui-Qi Li

    1   College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, P. R. China (Ringgold ID: RIN47856)
  • Chunfeng Li

    2   Affiliated Hospital of Shandong, Shandong University of Traditional Chinese Medicine, Jinan, P. R. China (Ringgold ID: RIN74738)
  • Tao Liu

    1   College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, P. R. China (Ringgold ID: RIN47856)
  • Peng Yang

    1   College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, P. R. China (Ringgold ID: RIN47856)

We acknowledge financial support from the National Natural Science Foundation of China (22278249), the Taishan Scholars Program (tsqn202306151) and the Natural Science Foundation of Shandong Province (ZR2021YQ13)
Supported by: National Natural Science Foundation of China 22278249,tsqn202306151


Graphical Abstract

Abstract

A tandem oxidation–condensation–cyclization of alcohols with tryptamines was developed under open-air atmosphere. Various harmless and readily available alcohols were used instead of aldehydes for the condensation with amines and subsequent cyclization to afford pharmacologically active tetrahydro-β-carboline products. Mechanistic studies reveal that the base promotes the initial dehydrogenation of alcohols to aldehydes, and the subsequent amine trapping of the reactive aldehydes is the key driving force that shifts the equilibrium, thus allowing the catalytic cycle to proceed continuously to full conversion. A 30 mmol-scale (6.5 g) experiment and the synthesis of two bioactive molecules demonstrated that the method is operationally simple, cost effective, and highly practical.



Publication History

Received: 01 October 2025

Accepted after revision: 12 November 2025

Accepted Manuscript online:
12 November 2025

Article published online:
31 December 2025

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