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Related Experiment Videos

The aspartimide problem in Fmoc-based SPPS. Part I.

M Mergler1, F Dick, B Sax

  • 1BACHEM AG, Hauptstr. 144, CH-4416 Bubendorf, Switzerland.

Journal of Peptide Science : an Official Publication of the European Peptide Society
|February 18, 2003
PubMed
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Minimizing aspartimide formation during peptide synthesis is crucial. Researchers found that using 3-methylpent-3-yl protection for the Asp side chain and Hmb backbone protection for Gly significantly suppressed aspartimide by-products.

Area of Science:

  • Organic Chemistry
  • Peptide Chemistry
  • Biochemistry

Background:

  • The aspartimide side reaction is a common challenge in peptide synthesis, leading to unwanted by-products.
  • Protecting group strategies are essential for controlling side reactions in solid-phase peptide synthesis.

Purpose of the Study:

  • To investigate the aspartimide problem in detail by evaluating various Asp beta-carboxy protecting groups and Fmoc cleavage protocols.
  • To identify optimal protecting group combinations for minimizing aspartimide formation during peptide synthesis.

Main Methods:

  • Synthesis of a model hexapeptide (H-VKDGYI-OH) using different Fmoc-Asp-OH derivatives and backbone protection strategies.
  • Evaluation of three new Fmoc-Asp-OH derivatives: beta-(4-pyridyl-diphenylmethyl) ester, beta-(9-phenyl-fluoren-9-yl) ester, and an orthoester derivative.

Related Experiment Videos

  • Quantification of aspartimide and related by-product formation using reversed-phase high-performance liquid chromatography (RP-HPLC).

    • Main Results:

    • The use of 3-methylpent-3-yl protection for the Asp side chain demonstrated significant improvements in reducing aspartimide formation.
    • Complete suppression of aspartimide formation was achieved by combining t-butyl (OtBu) side chain protection with Hmb backbone protection for the preceding Gly residue.
    • New Fmoc-Asp-OH derivatives were synthesized and tested, contributing to the understanding of their impact on aspartimide formation.

    Conclusions:

    • Specific protecting group strategies, particularly the combination of OtBu and Hmb, can effectively suppress aspartimide formation in peptide synthesis.
    • The choice of Asp side chain and backbone protecting groups is critical for achieving high purity in synthesized peptides.
    • This study provides valuable insights for optimizing peptide synthesis protocols to avoid aspartimide-related impurities.