Highly efficient one-pot assembly of peptides by double chemoselective coupling

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Biochemistry

Background:

• Peptide synthesis is crucial for drug discovery and biochemical research.
• Traditional methods can be time-consuming, require multiple steps, and may lead to epimerization.
• Advancements in synthetic methodologies are needed to improve efficiency and yield.

Purpose of the Study:

• To develop a novel, efficient, and user-friendly method for solution-phase peptide synthesis.
• To establish a one-pot, three-step cascade protocol for synthesizing oligopeptides.
• To demonstrate high yields and minimal epimerization in the synthesized peptides.

Main Methods:

• A one-pot, three-step cascade reaction was developed for peptide bond formation.
• The protocol utilizes chemoselective introduction of two peptide bonds.
• Compatibility with various N-protecting groups (Z, Boc, Fmoc) and amino acid types (d/l, non-proteinogenic) was assessed.

Main Results:

• Oligopeptides ranging from tri- to hexapeptides were successfully synthesized.
• High global yields (80-95%) were achieved.
• Virtually no epimerization was detected, confirmed by High-Performance Liquid Chromatography (HPLC).

Conclusions:

• The developed methodology offers a faster, easier, and milder approach to peptide synthesis.
• The one-pot cascade method operates efficiently at equimolar amounts.
• This protocol is versatile, accommodating diverse protecting groups and amino acid building blocks.