Scaffold Diversity Synthesis Delivers Complex, Structurally, and Functionally Distinct Tetracyclic Benzopyrones.

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Synthetic Chemistry

Background:

• Developing novel molecular scaffolds with high sp3 character is crucial for discovering new drugs.
• Existing synthetic methods often lack the efficiency and stereoselectivity needed for complex scaffold generation.

Purpose of the Study:

• To present a novel, highly stereoselective synthesis approach for complex tetracyclic benzopyrones.
• To demonstrate the scaffold diversity achievable through cascade double-annulation reactions.

Main Methods:

• Utilized cascade double-annulation reactions between zwitterionic/non-zwitterionic partners and 3-formylchromones.
• Generated tetracyclic benzopyrone scaffolds with up to four contiguous chiral centers.
• Included the formation of an all-carbon quaternary center within the synthesized scaffolds.

Main Results:

• Successfully synthesized diverse, highly complex tetracyclic benzopyrone scaffolds.
• Achieved high stereoselectivity in the annulation process.
• Demonstrated that differently ring-fused benzopyrones exhibit distinct biological activities.

Conclusions:

• The developed cascade double-annulation strategy is effective for generating complex, stereodefined benzopyrone scaffolds.
• The synthesized benzopyrones show significant potential for applications in medicinal chemistry and chemical biology.
• This approach offers a powerful tool for scaffold diversity synthesis in drug discovery efforts.