Chloroalkene dipeptide isosteres as peptidomimetics.

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Drug Discovery

Background:

• Peptides are valuable in drug discovery but suffer from low metabolic stability and off-target interactions.
• Peptidomimetics offer a strategy to overcome these limitations by modifying peptide structures.
• Developing stable and bioactive peptide analogs is crucial for therapeutic advancement.

Purpose of the Study:

• To design and synthesize novel chloroalkene dipeptide isosteres (CADIs) as a new class of peptidomimetics.
• To establish a practical synthetic route for CADIs, enabling their incorporation into peptide structures.
• To demonstrate the utility of CADIs in solid-phase peptide synthesis and bioactive peptide modification.

Main Methods:

• Development of a synthetic method for CADIs, replacing amide bonds with chloroalkene structures.
• Utilizing diastereoselective allylic alkylation with organocopper reagents for key CADI synthesis.
• Employing Fmoc (fluorenylmethoxycarbonyl) protection strategies for CADI manipulation and peptide synthesis.

Main Results:

• Successful synthesis of N-tert-butylsulfonyl protected CADIs via a diastereoselective route.
• Efficient conversion of protected CADIs to Fmoc-protected analogs suitable for peptide synthesis.
• Demonstration of CADI incorporation into bioactive peptides using Fmoc-based solid-phase synthesis.

Conclusions:

• CADIs represent a viable peptidomimetic strategy to enhance peptide drug stability and bioactivity.
• The developed synthetic protocols provide practical access to CADIs and CADI-containing peptide mimetics.
• This work facilitates the development of next-generation peptide-based therapeutics with improved pharmacological profiles.