Volume 136, Issue 38 e202407149
Forschungsartikel

Stereodivergent Total Synthesis of Tacaman Alkaloids

Xiangtao Chen

Xiangtao Chen

Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041 China

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Huijing Wang

Huijing Wang

Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041 China

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Jie Zeng

Jie Zeng

Pharmaceutical Research Institute, Wuhan Institute of Technology, Wuhan, 430205 China

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Qiuhong Li

Qiuhong Li

Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041 China

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Tonghui Zhang

Tonghui Zhang

Pharmaceutical Research Institute, Wuhan Institute of Technology, Wuhan, 430205 China

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Qiaoyun Yang

Qiaoyun Yang

Pharmaceutical Research Institute, Wuhan Institute of Technology, Wuhan, 430205 China

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Pei Tang

Corresponding Author

Pei Tang

Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041 China

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Fen-Er Chen

Corresponding Author

Fen-Er Chen

Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041 China

Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai, 200433 China

Shanghai Engineering Center of Industrial Asymmetric Catalysis for Chiral Drugs, Shanghai, 200433 China

College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, 330022 China

Pharmaceutical Research Institute, Wuhan Institute of Technology, Wuhan, 430205 China

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First published: 01 July 2024

Abstract

This paper describes a concise, asymmetric and stereodivergent total synthesis of tacaman alkaloids. A key step in this synthesis is the biocatalytic Baeyer–Villiger oxidation of cyclohexanone, which was developed to produce seven-membered lactones and establish the required stereochemistry at the C14 position (92 % yield, 99 % ee, 500 mg scale). Cis- and trans-tetracyclic indoloquinolizidine scaffolds were rapidly synthesized through an acid-triggered, tunable acyl-Pictet–Spengler type cyclization cascade, serving as the pivotal reaction for building the alkaloid skeleton. Computational results revealed that hydrogen bonding was crucial in stabilizing intermediates and inducing different addition reactions during the acyl-Pictet–Spengler cyclization cascade. By strategically using these two reactions and the late-stage diversification of the functionalized indoloquinolizidine core, the asymmetric total syntheses of eight tacaman alkaloids were achieved. This study may potentially advance research related to the medicinal chemistry of tacaman alkaloids.

Conflict of Interests

The authors declare no competing financial interest.

Data Availability Statement

The data that support the findings of this study are available in the Supporting Information of this article.

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