Short Formal Syntheses of Lycorine and Congeners Using a 5-Endo-Trig/6-Endo-Trig Radical Cyclization Sequence

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Drug Discovery

Background:

• Lycorine and its congeners are natural products with significant medicinal interest.
• Existing synthetic routes may be inefficient or lack practicality for large-scale production.
• There is an urgent need for novel antiviral therapeutics.

Purpose of the Study:

• To establish a practical and efficient synthetic strategy for lycorine congeners.
• To achieve formal syntheses of various lycorine-type natural products.
• To lay the groundwork for developing new antiviral drugs based on lycorine.

Main Methods:

• A novel synthetic strategy employing a back-to-back 5-endo-trig/6-endo-trig radical cyclization sequence.
• Systematic experimental investigation of the radical cyclization sequence.
• Computational studies to understand the mechanism and efficiency of the cyclization.

Main Results:

• A practical and efficient route to medicinally interesting lycorine congeners was successfully developed.
• Formal syntheses of multiple lycorine-type natural products, including lycorine itself, were accomplished.
• The key radical cyclization sequence was validated both experimentally and computationally.

Conclusions:

• The developed synthetic strategy is efficient and practical for accessing lycorine-type compounds.
• This work provides a foundation for the future development of antiviral therapeutics derived from lycorine.
• The findings will accelerate research into lycorine-based drug discovery.