Total Syntheses of Periconiasins A-E

Area of Science:

• Organic Chemistry
• Natural Product Synthesis
• Medicinal Chemistry

Background:

• Periconiasins A-E are naturally occurring cytochalasans with potential biological activities.
• The complex polycyclic structures of these compounds present significant synthetic challenges.

Purpose of the Study:

• To achieve the first collective total syntheses of periconiasins A-E.
• To develop novel synthetic strategies for constructing complex polycyclic frameworks.

Main Methods:

• Rationally designed and bioinspired chemical transformations.
• Tandem aldol condensation/Grob fragmentation for precursor assembly.
• Diels-Alder macrocyclization for tricyclic core construction.
• Transannular carbonyl-ene reaction for polycyclic framework formation.

Main Results:

• Successful and collective total syntheses of periconiasins A-E were accomplished.
• The synthetic routes efficiently constructed the intricate molecular architectures.
• Key stereochemical and regiochemical challenges were overcome.

Conclusions:

• The developed synthetic strategies provide access to periconiasins A-E and related analogs.
• This work expands the toolbox for constructing complex polycyclic natural products.
• The syntheses pave the way for further biological evaluation of these cytochalasans.