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- W2769742246 abstract "The design of constrained peptides is of prime importance in the development of bioactive compounds and for applications in supramolecular chemistry. Due to its nature, the peptide bond undergoes a spontaneous cis-trans isomerism, and the cis isomers are much more difficult to stabilize than the trans forms. By using oxazolidine-based pseudoprolines (ΨPro) substituted by a trifluoromethyl group, we show that the cis peptide bond can be readily switched from 0% to 100% in Xaa-ΨPro dipeptides. Our results prove that changing the configuration of the Cα in Xaa or in ΨPro is sufficient to invert the cis:trans populations while changing the nature of the Xaa side chain finely tuned the conformers ratio. Moreover, a strong correlation is found between the puckering of the oxazolidine ring and the peptide bond conformation. This finding highlights the role of the trifluoromethyl group in the stabilization of the peptide bond geometry. We anticipate that such templates will be very useful to constrain the backbone geometry of longer peptides." @default.
- W2769742246 created "2017-12-04" @default.
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- W2769742246 date "2017-11-29" @default.
- W2769742246 modified "2023-10-18" @default.
- W2769742246 title "Homochiral versus Heterochiral Trifluoromethylated Pseudoproline Containing Dipeptides: A Powerful Tool to Switch the Prolyl-Amide Bond Conformation" @default.
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- W2769742246 doi "https://doi.org/10.1021/acs.joc.7b01944" @default.
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