Total Synthesis of Actinophyllic Acid

Area of Science:

• Organic Chemistry
• Natural Product Synthesis
• Medicinal Chemistry

Background:

• Actinophyllic acid is a complex indolohydroazocine natural product.
• Total synthesis provides access to complex molecules for further study.

Purpose of the Study:

• To report the first total synthesis of actinophyllic acid.
• To develop an efficient and scalable synthetic route.

Main Methods:

• Retrosynthetic analysis to simplify the target molecule.
• Desymmetrization of a [4.4.1] bicyclic trienone.
• Key reactions included catalytic dihydroxylation, nitrile oxide dipolar cycloaddition, and palladium-catalyzed aminoarylation.
• Late-stage reductive cascade indolization and alkylation.

Main Results:

• A novel and efficient synthetic route to actinophyllic acid was established.
• The synthesis successfully navigated the complex stereochemistry of the natural product.
• The strategy highlights the utility of desymmetrization and cascade reactions in complex molecule synthesis.

Conclusions:

• The total synthesis of actinophyllic acid was successfully accomplished.
• The developed synthetic methodology can be applied to other complex natural products.
• This work expands the synthetic chemist's toolkit for constructing indolohydroazocine scaffolds.