Complex cyclic peptide synthesis via serine/threonine ligation chemistry

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Natural Product Synthesis

Background:

• Non-ribosomal cyclic peptides are prevalent in nature and possess significant bioactivities and pharmacological potential.
• Their complex structures make them challenging yet desirable targets for chemical synthesis.
• Peptide cyclization is a key step in synthesizing these molecules.

Purpose of the Study:

• To demonstrate the utility of chemoselective peptide ligation for the total synthesis of complex cyclic peptides.
• To highlight the advantages of this ligation-based strategy over traditional macrolactamization.
• To showcase specific examples of structurally intricate cyclic peptides synthesized using this method.

Main Methods:

• Total synthesis of structurally complex cyclic peptides.
• Application of chemoselective peptide ligation for macrocyclization.
• Comparison with traditional dehydration-based peptide macrolactamization.

Main Results:

• Successful total synthesis of several complex cyclic peptide examples.
• Demonstration of peptide ligation as a viable and advantageous cyclization strategy.
• Highlighting unique features of the developed synthetic routes.

Conclusions:

• Chemoselective peptide ligation is a powerful and versatile method for the synthesis of complex cyclic peptides.
• This approach offers advantages over conventional methods for peptide cyclization.
• The presented strategies facilitate access to valuable natural products.