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Updated: Jul 14, 2025

Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine
Published on: June 13, 2022
Total Synthesis of (-)-Enigmazole B
Yoshihiro Goda1, Haruhiko Fuwa1
1Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan.
This study reports the first-ever total synthesis of (-)-enigmazole B, a complex natural product. Key synthetic steps include cross-metathesis, Sonogashira coupling, and gold-catalyzed reactions for constructing the molecule.
Area of Science:
- Organic Chemistry
- Natural Product Synthesis
Background:
- (-)-enigmazole B is a marine natural product with a complex structure.
- Previous synthetic efforts have not achieved the total synthesis of (-)-enigmazole B.
Purpose of the Study:
- To achieve the first total synthesis of (-)-enigmazole B.
- To develop efficient synthetic strategies for constructing complex macrolactones.
Main Methods:
- Olefin cross-metathesis and hemiacetalization/intramolecular oxa-Michael addition.
- Sonogashira cross-coupling.
- Gold-catalyzed intramolecular alkyne hydroalkoxylation.
- Yamaguchi macrolactonization.
Main Results:
- Successful total synthesis of (-)-enigmazole B.
- Construction of the (E)-configured enol tosylate intermediate.
- Assembly of all carbon atoms via Sonogashira coupling.
- Formation of the dihydropyran ring using Au-catalyzed hydroalkoxylation.
- Completion of the 18-membered macrolactone skeleton through Yamaguchi macrolactonization.
Conclusions:
- The first total synthesis of (-)-enigmazole B was accomplished.
- The developed synthetic route is efficient and highlights novel methodologies for natural product synthesis.
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