Recent Syntheses and Strategies toward Polycyclic Gelsemium Alkaloids

Area of Science:

• Organic Chemistry
• Natural Product Synthesis
• Medicinal Chemistry

Background:

• Gelsemium alkaloids are a class of complex natural products with significant pharmacological interest.
• The synthesis of these alkaloids presents considerable challenges due to their intricate structures.

Purpose of the Study:

• To provide a comprehensive overview of comparative synthetic strategies for gelsemine and gelsedine classes of gelsemium alkaloids.
• To highlight diverse methodologies for constructing key structural features within these targets.

Main Methods:

• Review of published synthetic routes and methodologies.
• Comparative analysis of strategies targeting specific substructures.
• Focus on the construction of fused bicycles, piroxindole moieties, N-heterocycles, and THP moieties.

Main Results:

• Detailed discussion of various approaches to synthesize the [3.2.1]bicycle and oxabicycle cores.
• Strategies for creating the C7 quaternary center in the piroxindole moiety are presented.
• Methods for assembling the N-heterocycles and the C20 quaternary center in the THP moiety are compared.

Conclusions:

• The review underscores the versatility and ingenuity in synthetic approaches to gelsemium alkaloids.
• Understanding these strategies is crucial for future development of novel synthetic routes and analogs.