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Amino acids with aryl-keto function in their side chains

M A Bednarek1

  • 1Merck Research Laboratories, Rahway, New Jersey 07065, USA. maria_bednarek@merck.com

The Journal of Peptide Research : Official Journal of the American Peptide Society
|October 17, 1998
PubMed
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Researchers synthesized novel aryl-keto amino acids using omega-carboxyamino acids and liquid hydrogen fluoride. These new building blocks were successfully incorporated into peptides without forming unwanted byproducts, demonstrating their utility in peptide synthesis.

Area of Science:

  • Organic Chemistry
  • Peptide Chemistry
  • Synthetic Methodology

Background:

  • Traditional peptide synthesis often faces challenges with side-chain modifications.
  • Developing novel amino acid building blocks is crucial for expanding peptide functionalities.
  • Aryl-keto functionalities offer unique properties for peptide design.

Purpose of the Study:

  • To develop a novel synthetic route for aryl-keto amino acids.
  • To evaluate the utility of these new amino acids in peptide synthesis.
  • To assess the stability and reactivity of aryl-keto amino acids during peptide coupling.

Main Methods:

  • Reaction of omega-carboxyamino acids with liquid HF and aromatic compounds.
  • Conversion to N-tert-butyloxycarbonyl (Boc) or N-fluorenylmethoxycarbonyl (Fmoc) derivatives.

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  • Incorporation into peptides using standard coupling techniques.
  • Analysis of crude products using liquid chromatography-mass spectrometry (LC-MS).

    • Main Results:

    • Excellent yields of aryl-keto amino acids were achieved.
    • The synthesized amino acids were readily converted into Boc and Fmoc protected derivatives.
    • No cyclic Schiff base formation was observed during coupling of specific aryl-keto amino acids.
    • Truncated peptides were not detected in crude products, indicating efficient coupling.

    Conclusions:

    • A robust method for synthesizing aryl-keto amino acids was established.
    • These novel amino acids are compatible with standard peptide synthesis protocols.
    • The developed methodology provides valuable building blocks for creating complex peptides with new functionalities.