Serine/threonine ligation for natural cyclic peptide syntheses

Area of Science:

• Organic Chemistry
• Natural Product Synthesis
• Medicinal Chemistry

Background:

• Cyclic peptides are abundant natural products with significant biological activities.
• Total synthesis of cyclic peptides presents challenges, particularly in preparing unnatural amino acids and achieving efficient peptide cyclization.
• Peptide cyclization is an entropy-disfavored process, often requiring protecting groups and facing competition between intermolecular and intramolecular reactions.

Purpose of the Study:

• To highlight the application of chemoselective ligation-mediated peptide cyclization.
• To address the challenges in the total synthesis of natural cyclic peptides.
• To provide a more efficient and less arbitrary approach to peptide cyclization.

Main Methods:

• Review of chemoselective ligation strategies for peptide cyclization.
• Discussion of how these methods overcome limitations of traditional chemical synthesis.
• Focus on the synthesis of natural cyclic peptides from 2000 to 2014.

Main Results:

• Chemoselective ligation offers a powerful strategy for constructing cyclic peptides.
• This approach simplifies the synthesis by reducing reliance on complex protecting group strategies.
• Demonstrated success in the total synthesis of various natural cyclic peptides.

Conclusions:

• Chemoselective ligation-mediated cyclization is an effective method for natural cyclic peptide synthesis.
• This technique offers advantages over traditional methods, reducing trial-and-error.
• Facilitates the preparation of complex cyclic peptides with biological relevance.