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Total Synthesis of Brasilicardin A
Zhe Wang1, Yuan Wang1, Danyang Hu1
1State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.
Researchers developed a new synthesis for brasilicardin A, a potent immunosuppressant. This practical method efficiently creates its complex trans-syn-trans perhydrophenanthrene core structure.
Area of Science:
- Organic Chemistry
- Natural Product Synthesis
- Medicinal Chemistry
Background:
- Brasilidin A is a diterpene natural product.
- It exhibits potent immunosuppressive effects.
- Its structure features a unique trans-syn-trans perhydrophenanthrene skeleton.
Purpose of the Study:
- To report a practical synthetic method for brasilicidin A.
- To construct the unusual trans-syn-trans perhydrophenanthrene skeleton.
- To enhance reaction efficiency through an optimized protecting-group strategy.
Main Methods:
- Diastereoselective Eschenmoser-Claisen rearrangement.
- Highly diastereoselective alkylation of a decalin nitrile.
- Me2CuLi-mediated intramolecular Michael addition.
Main Results:
- Successful construction of the strained, functionalized trans-syn-trans perhydrophenanthrene skeleton.
- Demonstration of a practical synthetic route to brasilicidin A.
- Improved reaction efficiency via an optimized protecting-group strategy.
Conclusions:
- A practical and efficient synthetic method for brasilicidin A has been established.
- The synthesis effectively builds the complex perhydrophenanthrene core.
- This work provides a valuable route for accessing immunosuppressive natural products.
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