Total synthesis of aphadilactones A-D

Area of Science:

• Organic Chemistry
• Natural Product Synthesis
• Medicinal Chemistry

Background:

• Aphanamixis grandifolia is a plant species belonging to the Meliaceae family.
• Aphadilactones A-D are diastereomeric natural products recently isolated from this plant.
• These natural products possess an unprecedented carbon skeleton, making them of significant synthetic interest.

Purpose of the Study:

• To achieve the first total synthesis of aphadilactones A-D.
• To develop novel synthetic methodologies for constructing complex natural products.
• To explore the chemical space around the aphadilactone scaffold.

Main Methods:

• Catalytic asymmetric hetero-Diels-Alder reaction for dihydropyran ring formation.
• Tandem acid-catalyzed acetal cleavage, oxidation, and cyclization for lactone and furan installation.
• Intermolecular Diels-Alder reaction to assemble the core carbon skeleton.

Main Results:

• Successful total synthesis of aphadilactones A-D.
• Demonstration of a novel catalytic asymmetric hetero-Diels-Alder reaction.
• Establishment of a tandem process for concurrent installation of key functional groups.

Conclusions:

• The first total synthesis of aphadilactones A-D provides access to these complex natural products.
• The developed synthetic route showcases efficient strategies for constructing intricate molecular architectures.
• This work paves the way for further investigation into the biological activities and structural analogs of aphadilactones.