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Related Experiment Videos

3-Nitro-2-pyridinesulfenates as Efficient Solution- and Solid-Phase Disulfide Bond Forming Agents.

Akihiro Taguchi1, Kiyotaka Kobayashi1, Akira Kotani2

  • 1Department of Medicinal Chemistry, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 14, 2017
PubMed
Summary

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A novel reagent, methyl 3-nitro-2-pyridinesulfenate (Npys-OMe), efficiently forms disulfide bonds in peptides. This method enables the regioselective synthesis of complex peptides like oxytocin with high yields and minimal byproducts.

Area of Science:

  • Organic Chemistry
  • Peptide Synthesis
  • Biochemistry

Background:

  • Disulfide bond formation is crucial for peptide structure and function.
  • Existing methods for disulfide bond formation can suffer from low yields, side reactions, and limited regioselectivity.

Purpose of the Study:

  • To report a new disulfide-forming agent, methyl 3-nitro-2-pyridinesulfenate (Npys-OMe).
  • To demonstrate the efficacy of Npys-OMe in synthesizing complex disulfide-containing peptides, including oxytocin.

Main Methods:

  • Synthesis of Npys-OMe from 3-nitro-2-pyridinesulfenyl chloride.
  • Oxidation of thiol groups using Npys-OMe for disulfide bond formation.
  • Application of Npys-OMe in both solution-phase and solid-phase peptide synthesis.
Keywords:
3-nitro-2-pyridinesulfenyldisulfide bond formationoxidationpeptidessolid-phase synthesis

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Main Results:

  • Npys-OMe efficiently produced oxytocin from its linear form in 92% yield with minimal oligomerization.
  • Successful synthesis of other complex peptides, including α-human atrial natriuretic peptide and α-conotoxin ImI.
  • No observed side reactions involving methionine, tryptophan residues, or the S-acetamidomethyl (Acm) protecting group.

Conclusions:

  • Npys-OMe represents a new, effective reagent for regioselective disulfide bond formation.
  • This method offers a valuable strategy for synthesizing complex, disulfide-rich peptides.
  • The reagent's compatibility with sensitive amino acid residues and protecting groups enhances its utility.