Total synthesis of asterredione

Area of Science:

• Organic Chemistry
• Synthetic Chemistry

Background:

• Asterredione is a natural product with a unique 1,3-cyclopentenedione structure.
• Efficient synthetic routes to complex natural products are crucial for further biological investigation.

Purpose of the Study:

• To report the first total synthesis of asterredione.
• To demonstrate the utility of a novel Darzens/ring-expansion strategy.

Main Methods:

• A five-step linear synthesis was designed.
• The key step involved a Darzens reaction followed by ring expansion to form the cyclopentenedione core.
• X-ray crystallography was used for structural confirmation.

Main Results:

• Asterredione was synthesized in 21.5% overall yield.
• The Darzens/ring-expansion strategy efficiently constructed the 2-quaternary 1,3-cyclopentenedione skeleton.
• The synthesized compound's structure was unequivocally confirmed by X-ray crystallography.

Conclusions:

• The first total synthesis of asterredione was successfully completed.
• The developed Darzens/ring-expansion strategy is effective for constructing complex cyclic diketones.
• This synthesis provides a foundation for accessing asterredione analogs.