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Related Experiment Videos

Two-step hard acid deprotection/cleavage procedure for solid phase peptide synthesis.

M Nomizu1, Y Inagaki, T Yamashita

  • 1Central Laboratories of Key Technology, Kirin Brewery Co., Ltd., Maebashi Gunma, Japan.

International Journal of Peptide and Protein Research
|February 1, 1991
PubMed
Summary
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A novel two-step method enhances solid-phase peptide synthesis by efficiently removing t-butoxycarbonyl (Boc) protecting groups and cleaving peptides from resins. This procedure improves the synthesis of complex peptides like urotensin II and human endothelin.

Area of Science:

  • Organic Chemistry
  • Biochemistry
  • Peptide Synthesis

Background:

  • Solid-phase peptide synthesis (SPPS) relies on efficient protection/deprotection strategies.
  • Current methods for t-butoxycarbonyl (Boc) group removal and peptide cleavage can be harsh or inefficient.
  • Optimizing these steps is crucial for synthesizing complex and biologically active peptides.

Purpose of the Study:

  • To introduce a new two-step deprotection and cleavage procedure for Boc-based SPPS.
  • To evaluate the efficiency of this method for removing protecting groups and cleaving peptides from 4-(oxymethyl)-phenylacetamidomethyl (PAM) resin.
  • To demonstrate the method's utility in synthesizing challenging peptide targets.

Main Methods:

  • A two-step acid-mediated approach using trimethylsilyl bromide-thioanisole/trifluoroacetic acid (TFA) for deprotection.

Related Experiment Videos

  • Subsequent cleavage from PAM resin using stronger acids like trimethylsilyl trifluoromethanesulfonate in TFA or hydrogen fluoride (HF).
  • Assessment of deformylation of N-in-formyltryptophan moieties.

    • Main Results:

    • The novel procedure effectively removes Boc protecting groups and cleaves peptides from PAM resin.
    • Efficient deformylation of N-in-formyltryptophan was achieved.
    • Successful synthesis of urotensin II and human endothelin demonstrated the method's practical applicability.

    Conclusions:

    • The developed two-step deprotection/cleavage method offers an efficient alternative for Boc-based SPPS.
    • This procedure is suitable for practical peptide synthesis, including complex targets.
    • The method provides a valuable tool for researchers in peptide chemistry and drug discovery.