Trifluoromethylated Proline Surrogates as Part of "Pro-Pro" Turn-Inducing Templates
Charlène Gadais1, Kevin Van Holsbeeck1,2, Samuel L C Moors3
1Research Group of Organic Chemistry, Departments of Bioengineering Sciences and Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050, Brussels, Belgium.
This study introduces novel trifluoromethylated proline analogues as enhanced beta-turn inducers in peptidomimetics. The (R)-Pro-(R)-TfmOxa template demonstrates superior conformational stability for designing peptide-based therapeutics.
Area of Science:
- Medicinal Chemistry
- Organic Chemistry
- Structural Biology
Background:
- Proline residues are key inducers of peptide turns.
- Beta-hairpin peptidomimetics often utilize d-Pro-l-Pro templates.
- Prolyl amide bond cis-trans isomerization affects conformational stability.
Purpose of the Study:
- To investigate α-trifluoromethylated proline analogues as enhanced β-turn inducers.
- To design peptidomimetics with improved conformational stability.
- To explore the impact of trifluoromethyl groups on peptide conformation.
Main Methods:
- Theoretical conformational analysis to select potential templates.
- Synthesis of a novel β-turn model incorporating the selected template.
- Nuclear Magnetic Resonance (NMR) spectroscopy to analyze conformational preferences.
Main Results:
- The dipeptide (R)-Pro-(R)-TfmOxa was identified as a promising template.
- A synthetic pathway was developed for the Ac-(R)-Pro-(R)-TfmOxa-(S)-Val-OtBu model.
- NMR data confirmed a predominant trans-trans conformer and internal hydrogen bonding.
Conclusions:
- The (R)-Pro-(R)-TfmOxa template effectively induces β-turns.
- Incorporation of trifluoromethylated proline analogues enhances conformational control.
- This template design is suitable for developing stable peptidomimetics.
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