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- W2005533930 abstract "We explore strategies to enhance conformational ordering of N-substituted glycine peptoid oligomers. Peptoids bearing bulky N-alkyl side chains have previously been studied as important examples of biomimetic “foldamer” compounds, as they exhibit a capacity to populate helical structures featuring repeating cis-amide bonds. Substantial cis/trans amide bond isomerization, however, gives rise to conformational heterogeneity. Here, we report the use of N-aryl side chains as a tool to enforce the presence of trans-amide bonds, thereby engendering structural stability. Aniline derivatives and bromoacetic acid are used in the facile solid-phase synthesis of a diverse family of sequence-specific N-aryl glycine oligomers. Quantum mechanics calculations yield a detailed energy profile of the folding landscape and substantiate the hypothesis that the presence of anilide groups establishes a strong energetic preference for trans-amide bonds. X-ray crystallographic analysis and solution NMR studies verify this preference. Molecular modeling indicates that the linear oligomers can adopt helical structures resembling a polyproline type II helix. High resolution structures of macrocyclic oligomers incorporating both N-alkyl and N-aryl glycine units confirm the ability to direct the presence of trans-amide bonds specifically at N-aryl positions. These results are an important step in developing strategies for the rational de novo design of new structural motifs in biomimetic oligopeptoid systems." @default.
- W2005533930 created "2016-06-24" @default.
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- W2005533930 date "2008-11-17" @default.
- W2005533930 modified "2023-09-29" @default.
- W2005533930 title "Oligo(<i>N-</i>aryl glycines): A New Twist on Structured Peptoids" @default.
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- W2005533930 doi "https://doi.org/10.1021/ja804580n" @default.
- W2005533930 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19049458" @default.
- W2005533930 hasPublicationYear "2008" @default.
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