A Highly Convergent Total Synthesis of Leustroducsin B

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Medicinal Chemistry

Background:

• Leustroducsin B possesses significant biological activities and a complex molecular structure.
• Developing efficient synthetic routes is crucial for accessing and studying such molecules.

Purpose of the Study:

• To achieve an efficient and highly convergent total synthesis of Leustroducsin B.
• To establish robust methods for constructing complex molecular architectures.

Main Methods:

• A convergent synthesis strategy was employed, disconnecting Leustroducsin B into three key fragments.
• Fragment coupling involved chelate-controlled addition of vinyl zincate to an α-hydroxy ketone and silicon-mediated cross-coupling.
• Stereochemistry was established using catalytic asymmetric reactions, including zinc-ProPhenol-catalyzed aldol and palladium-catalyzed asymmetric allylic alkylation.

Main Results:

• The total synthesis was accomplished in 17 longest linear steps and 39 total steps.
• High yields and excellent diastereoselectivity (de) were achieved in the catalytic stereochemical setting steps.
• The convergent approach proved highly efficient for assembling the complex Leustroducsin B structure.

Conclusions:

• An efficient and convergent total synthesis of Leustroducsin B has been successfully developed.
• The synthetic strategy highlights the power of catalytic asymmetric reactions and strategic fragment coupling in complex molecule synthesis.