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A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products
Published on: October 4, 2019
Total synthesis of (-)-exiguolide
1Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 1-1 Tsutsumidori-amamiya, Aoba-ku, Sendai 981-8555, Japan. hfuwa@bios.tohoku.ac.jp
Organic Letters
|January 13, 2010
Summary
The first total synthesis of the natural enantiomer, (-)-exiguolide, was achieved. Key steps included efficient construction of the bis(tetrahydropyran) core and macrocycle formation, followed by side chain installation.
Area of Science:
- Organic Chemistry
- Natural Product Synthesis
- Medicinal Chemistry
Background:
- (-)-Exiguolide is a complex natural product with potential biological activities.
- The total synthesis of natural products is crucial for structure elucidation and analog development.
- Previous synthetic efforts have not yielded the natural enantiomer of exiguolide.
Purpose of the Study:
- To achieve the first total synthesis of the natural enantiomer of (-)-exiguolide.
- To develop an efficient and stereoselective synthetic route.
- To provide access to (-)-exiguolide for further biological evaluation.
Main Methods:
- Synthesis of the bis(tetrahydropyran) subunit using olefin cross-metathesis, intramolecular oxa-conjugate addition, and reductive etherification.
- Construction of the 20-membered macrocycle via Yamaguchi macrolactonization.
- Stereoselective introduction of the (E,Z,E)-triene side chain using Suzuki-Miyaura coupling.
Main Results:
- Successful and first-time total synthesis of (-)-exiguolide, the natural enantiomer.
- Efficient construction of the key bis(tetrahydropyran) structural motif.
- Stereocontrolled installation of the complex triene side chain.
Conclusions:
- The developed synthetic strategy provides a viable route to (-)-exiguolide.
- This synthesis validates key methodologies for constructing complex macrocyclic natural products.
- The availability of (-)-exiguolide enables future studies on its biological properties.
