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Total Synthesis of (-)-Preussochromone D
Eric Kerste1, Klaus Harms1, Ulrich Koert1
1Fachbereich Chemie , Philipps-Universität Marburg , Hans-Meerwein-Straße 4 , D-35032 Marburg , Germany.
Organic Letters
|May 29, 2019
Summary
Researchers report an efficient synthesis of (-)-preussochromone D, a natural product. Key steps include diastereoselective aldol additions and asymmetric additions to construct the complex tricyclic skeleton.
Area of Science:
- Organic Synthesis
- Natural Product Chemistry
- Stereoselective Synthesis
Background:
- Natural products serve as valuable scaffolds for drug discovery.
- (-)-Preussochromone D is a complex natural product with potential biological activity.
- Efficient and stereoselective synthetic routes are crucial for accessing such molecules.
Purpose of the Study:
- To develop an efficient and stereoselective synthetic strategy for (-)-preussochromone D.
- To establish key bond formations for constructing the tricyclic core.
- To demonstrate the utility of specific synthetic methodologies in complex molecule synthesis.
Main Methods:
- Diastereoselective intramolecular aldol addition of a chromanone to an α-ketoester.
- Asymmetric 1,4-addition of diisopropenyl zinc to a chromenone.
- Intermolecular diastereoselective aldol addition of methyl diazoacetate to an aldehyde, followed by oxidation.
- Use of a difluoromethyl ether protecting group to prevent side reactions.
Main Results:
- Successful construction of the tricyclic skeleton of (-)-preussochromone D.
- High diastereoselectivity achieved in key aldol addition reactions.
- Efficient oxidation of the diazo group to form the α-ketoester.
- Protection strategy effectively prevented unwanted oxidation of the chromanone moiety.
Conclusions:
- An efficient, stereoselective synthesis of (-)-preussochromone D has been achieved.
- The developed route highlights the power of diastereoselective aldol additions and asymmetric catalysis.
- This synthesis provides a viable pathway for accessing (-)-preussochromone D and related analogs.
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