Formal Total Synthesis of Amphidinolide E

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Natural Product Synthesis

Background:

• Amphidinolide E is a cytotoxic macrolide with potential therapeutic applications.
• The complex structure of amphidinolide E presents significant synthetic challenges.

Purpose of the Study:

• To achieve the first formal total synthesis of amphidinolide E.
• To develop and optimize key synthetic strategies for constructing the macrolide core.

Main Methods:

• Utilized three Julia-Kocienski reactions for diene formation (C5-C6, C9-C10, C17-C18).
• Employed a Suzuki-Molander reaction for C21-C22 bond construction.
• Incorporated a Kita-Trost macrolactonization for ring closure.

Main Results:

• Successfully synthesized amphidinolide E, demonstrating a viable synthetic route.
• Optimized Julia-Kocienski olefinations to maximize E/Z ratios for dienic systems.
• Addressed challenges related to stereocenter stability at C2 and protecting groups at C17-OH/C18-OH.

Conclusions:

• The reported synthesis provides a robust pathway to amphidinolide E.
• The optimized synthetic methodology can be applied to other complex macrolides.
• This work advances the field of natural product total synthesis.