Total synthesis of leustroducsin B

Area of Science:

• Organic Synthesis
• Medicinal Chemistry

Background:

• Leustroducsin B is a complex natural product with potential biological activity.
• Efficient synthetic routes are crucial for its further study and development.

Purpose of the Study:

• To develop a convergent synthetic route for Leustroducsin B.
• To explore the utility of specific coupling reactions in complex molecule synthesis.

Main Methods:

• Convergent synthesis utilizing three key segments (A, B, C).
• Key reactions included Sharpless asymmetric epoxidation, lipase-catalyzed kinetic resolution, Wittig reaction, Sharpless asymmetric dihydroxylation, Julia coupling, Nozaki-Hiyama-Kishi (NHK) reaction, Stille coupling, and phosphorylation.
• Asymmetric Diels-Alder reaction was used for segment C synthesis.

Main Results:

• The Julia coupling of segment B with segment A1 yielded low results due to epimerization.
• The NHK reaction of segment A2 with segment B provided the coupled product in good yield.
• Subsequent coupling with segment C and phosphorylation successfully yielded Leustroducsin B.

Conclusions:

• A convergent synthesis of Leustroducsin B was successfully established.
• The Nozaki-Hiyama-Kishi reaction proved effective for coupling key fragments.
• The developed route provides access to Leustroducsin B for further investigation.