The Total Synthesis of Hyperfirin via a Cyclooctadiene Strategy

Area of Science:

• Organic Chemistry
• Natural Product Synthesis
• Medicinal Chemistry

Background:

• Polycyclic polyprenylated acylphloroglucinols (PPAPs) are a class of natural products known for their intricate structures and significant biological activities.
• The complex architecture of PPAPs presents a substantial challenge for synthetic chemists, limiting the availability of these compounds for further study.

Purpose of the Study:

• To report the first total synthesis of Hyperfirin, a representative member of the PPAP family.
• To develop a novel and flexible modular strategy for the construction of complex PPAP skeletons.
• To explore new synthetic methodologies applicable to eight-membered ring chemistry.

Main Methods:

• A linear synthetic sequence was designed and executed for the total synthesis of Hyperfirin.
• A key step involved the formation of the bicyclo[3.3.1]nonane-2,4,9-trione core through transannular acylation of a functionalized eight-membered ring.
• Late-stage bridgehead substitution was employed to complete the molecular framework.

Main Results:

• The total synthesis of Hyperfirin was successfully achieved, validating the proposed synthetic strategy.
• The developed route demonstrates flexibility in constructing diverse PPAP analogues.
• The study expands the synthetic toolkit for accessing complex eight-membered ring systems.

Conclusions:

• The reported synthesis provides a viable and adaptable route to Hyperfirin and related PPAPs.
• This work highlights the power of modular synthesis in tackling complex natural product targets.
• The methodology offers new avenues for exploring the biological potential of PPAP compounds.