Total Synthesis of Calyciphylline F

Area of Science:

• Organic Chemistry
• Total Synthesis
• Natural Products Chemistry

Background:

• Daphniphyllum alkaloids are a class of complex natural products with significant biological activity.
• Calyciphylline F presents a unique synthetic challenge due to its strained 8-azatricyclo[4.2.1.0^4,8]nonane core.
• The total synthesis of such complex molecules is crucial for structure-activity relationship studies and potential drug discovery.

Purpose of the Study:

• To achieve the first total synthesis of calyciphylline F.
• To develop novel synthetic strategies for constructing strained polycyclic systems.
• To explore new methodologies in cycloaddition and radical cyclization reactions.

Main Methods:

• Employing a [4+3] cycloaddition reaction between pyrroles and 2-oxyallyl cations.
• Utilizing an intramolecular aldol reaction followed by xanthate trapping.
• Constructing the bridgehead quaternary carbon center via intramolecular radical addition.
• Completing the synthesis with a 6-exo-radical cyclization.

Main Results:

• Successful construction of the strained 8-azatricyclo[4.2.1.0^4,8]nonane ring system.
• Development of a novel strategy for building complex polycyclic alkaloid frameworks.
• Demonstration of the efficacy of radical cyclization in assembling intricate molecular architectures.

Conclusions:

• The total synthesis of calyciphylline F has been accomplished, validating the proposed synthetic route.
• This work provides a new platform for accessing Daphniphyllum alkaloids and related structures.
• The developed methodologies offer valuable tools for synthetic chemists tackling complex molecular targets.