Solid-Phase Biomimetic Synthesis of Polyketide

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Biomimetic Chemistry

Background:

• Polyketides are a diverse class of natural products with significant biological activities.
• Traditional polyketide synthesis is often complex and challenging.
• Developing efficient and scalable synthetic methodologies is crucial for accessing these valuable compounds.

Purpose of the Study:

• To develop a novel solid-phase biomimetic synthesis strategy for polyketides.
• To establish a robust and iterative method for carbon chain elongation and functionalization.
• To demonstrate the applicability of the developed method for synthesizing natural products.

Main Methods:

• Solid-phase synthesis involving decarboxylative Claisen condensation for carbon chain elongation.
• Stepwise transformation of β-ketothioester intermediates.
• Hydrolysis of thioester to regenerate carboxylic acid for iterative synthesis.
• Colorimetric assays (malachite green, iron(III) chloride) for reaction monitoring.
• Gel-phase 13C NMR for confirming substrate immobilization.

Main Results:

• Successful development of a solid-phase biomimetic polyketide synthesis.
• Demonstrated iterative carbon chain elongation and functional group manipulation on solid support.
• Convenient reaction monitoring using colorimetric tests.
• Confirmation of substrate immobilization via gel-phase 13C NMR.
• Synthesis of natural products xylapyrone C and kavain.

Conclusions:

• The established solid-phase method provides an efficient route for biomimetic polyketide synthesis.
• The method is amenable to further extension, including asymmetric synthesis, as shown by the potential synthesis of (R)-kavain.
• This approach offers a valuable tool for the synthesis of complex polyketide natural products.