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Total synthesis of (+)-trans-195A
Nicole Holub1, Jürgen Neidhöfer, Siegfried Blechert
1Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany.
Organic Letters
|March 25, 2005
Summary
The first enantioselective synthesis of (+)-trans-195A was achieved using novel ring-rearrangement metathesis and zirconium-mediated Negishi-coupling. This research determined the absolute configuration of natural trans-195A to be (2R,4aS,5R,8aS)-(-).
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
- Natural Product Synthesis
Background:
- Trans-195A is a complex natural product.
- Establishing the absolute configuration of natural products is crucial for understanding their biological activity.
Purpose of the Study:
- To achieve the first enantioselective synthesis of (+)-trans-195A.
- To determine the absolute configuration of naturally occurring trans-195A.
Main Methods:
- Ring-rearrangement metathesis (RRM) was employed as a key step.
- Zirconium-mediated Negishi-coupling was utilized for the first time in synthesizing six-membered heterocycles.
- Comparison of synthesized material with the natural product.
Main Results:
- Successful enantioselective synthesis of (+)-trans-195A.
- The absolute configuration of natural trans-195A was determined to be (2R,4aS,5R,8aS)-(-).
Conclusions:
- The developed synthetic strategy is effective for constructing complex heterocycles.
- The absolute configuration of natural trans-195A has been definitively assigned.