Pseudodiproline (Pro-Cyp) Oligomers Fold into Helical Polyproline Type secondary structures.

J Org Chem

Department of Chemistry, Université de Montréal, 1375 Ave. Thérèse-Lavoie-Roux, Montréal, H2V 0B3 QC Canada.

Published: April 2024

AI Article Synopsis

  • * These oligo-proline mimetics exhibit a right-handed helical conformation influenced by the configuration of the neighboring cyclopentane carboxylic acid unit.
  • * Unlike traditional polyproline, these synthetic Pro-Cyp oligomers gain stability from their backbone structure rather than from -π* interactions.

Article Abstract

The synthesis and conformational properties of oligo-proline mimetics composed of dimeric and tetrameric Pro-Cyp constructs linked by a hydroxymethylene unit are reported. Oligomers were studied both in the solid state and in solution, unveiling right-handed helical conformation depending on the configuration of the vicinally substituted -cyclopentane carboxylic acid unit (Cyp). Unlike polyproline oligomers, the alternating synthetic Pro-Cyp counterparts are not stabilized by -π* interactions but rely instead on the steric demands of the extended backbone conformation within the hydroxymethylene-linked Pro-Cyp repeating units.

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Source
http://dx.doi.org/10.1021/acs.joc.3c02840DOI Listing

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Article Synopsis
  • * These oligo-proline mimetics exhibit a right-handed helical conformation influenced by the configuration of the neighboring cyclopentane carboxylic acid unit.
  • * Unlike traditional polyproline, these synthetic Pro-Cyp oligomers gain stability from their backbone structure rather than from -π* interactions.
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Stereocontrolled methods are described for the synthesis of hitherto unreported pseudodiproline dimers in which a cyclopentane carboxylic acid is linked to a pyrrolidine residue by a stereochemically defined hydroxymethylene tether. These proline-cyclopentane (Pro-Cyp) dimers have interesting structural characteristics as seen in their X-ray crystal structures as well as their nuclear magnetic resonance (NMR) spectra in CDCl. They can be considered to be novel Pro-Pro mimetics, which can be used to replace natural diproline sequences with potential applications in medicinal chemistry.

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