Conformational Restriction of Peptides Using Dithiol Bis-Alkylation

Area of Science:

• Medicinal Chemistry
• Organic Chemistry
• Biochemistry

Background:

• Macrocyclic peptides are valuable as inhibitors of protein-protein interactions.
• Traditional cyclic peptide synthesis methods face limitations in accessing diverse chemical space.
• Cysteine alkylation reactions have emerged as a versatile approach for cyclic peptide discovery.

Purpose of the Study:

• To detail applications, methods, and mechanistic insights of dithiol bis-alkylation reactions for cyclic peptide production.
• To provide troubleshooting guidance for this macrocyclization technique.
• To highlight the utility of this method for generating loop-based protein-protein interaction inhibitors.

Main Methods:

• Utilizing dithiol bis-alkylation reactions for macrocyclization.
• Employing solution-phase synthesis for efficient cyclic peptide production.
• Applying rational design and library approaches for cyclic peptide discovery.

Main Results:

• Demonstrated versatility and robustness of cysteine alkylation chemistry for cyclic peptide synthesis.
• Enabled production of a wide array of conformationally constrained cyclic peptides.
• Facilitated rapid production and screening of loop-based inhibitors.

Conclusions:

• Dithiol bis-alkylation is an efficient solution-phase macrocyclization strategy.
• This method is highly effective for the rapid discovery and development of cyclic peptide inhibitors.
• The described chemistry expands access to conformationally constrained cyclic peptides for therapeutic applications.