Total synthesis of nhatrangin A

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Natural Product Synthesis

Background:

• Aplysiatoxins, oscillatoxins, and nhatrangins are complex natural products with significant biological activities.
• Efficient synthetic routes to these compounds and their analogs are crucial for further research.

Purpose of the Study:

• To develop a concise and stereoselective synthetic approach for key intermediates of aplysiatoxins, oscillatoxins, and nhatrangins.
• To demonstrate the utility of these intermediates in the total synthesis of nhatrangin A.

Main Methods:

• Synthesis of advanced intermediates: aromatic aldehyde 11 (8 steps, 44% yield) and dihydroxy acid 12 (3 steps, 55% yield).
• Key reactions included asymmetric Michael addition, CBS reduction, proline-catalyzed crossed-aldol reactions, Sharpless dihydroxylation, and RuO4-catalyzed over-oxidation.
• Total synthesis of nhatrangin A via Yamaguchi coupling and one-pot deprotection.

Main Results:

• Successful synthesis of aromatic aldehyde 11 and dihydroxy acid 12 with high stereoselectivity.
• Efficient generation of chirality in the main chain hydroxyaldehyde and appended side-chain dihydroxypentanoic acid.
• Completion of nhatrangin A total synthesis through optimized coupling and deprotection strategies.

Conclusions:

• A robust and stereoselective synthetic strategy for nhatrangin A and related natural products has been established.
• The developed methodology provides access to valuable intermediates for exploring the chemical space of these marine toxins.
• This work advances the field of natural product synthesis, offering efficient routes to complex molecular architectures.