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DOI: 10.1055/a-2746-2191
Amine-Facilitated Tandem Aerobic Oxidation and Cyclization to Tetrahydro-β-Carbolines
Authors
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

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.
Keywords
Alcohols - Tryptamines - Tandem oxidation - Metal-free catalysis - Open air - Tetrahydro-β-carbolinePublication 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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