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Purpose <p>We found that a byproduct characterized by a difference of 12 mass units is formed during TFA-mediated cleavage of azide-containing peptides from solid support. This study identifies this byproduct, provides a rationale for its formation and a solution for its inhibition.</p> Method <p>NMR and HRMS analyses as well as chemical synthesis is employed to identify the byproduct and probe the mechanism of its formation.</p> Results <p>Data is consistent with the conversion of azide to methylamine which occurs during peptide cleavage likely via a Schmidt rearrangement involving nucleophilic azide attack of t-butyl cations generated from the side chain deprotection of Boc- and t-butyl ether groups.</p> Conclusion <p>Installing azide-containing residues using the newly reported 2-(trimethylsilyl)ethoxycarbonyl (Teoc)-protected compound <b>3a</b> proved effective at significantly thwarting the formation of methylamine byproduct.</p>

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Elucidation and Prevention of an Unexpected Methylamine Byproduct Formed During Trifluoroacetic Acid-Mediated Side Chain Deprotection of Azido-Containing Peptides

  • 期刊论文

  • 发表日期：

    2025年5月14日

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  • Yixin Xie,
  • Tania L. Lopez-Silva,
  • Marzena A. Dyba,
  • Tanja Grkovic,
  • Joel P. Schneider

摘要

Purpose

We found that a byproduct characterized by a difference of 12 mass units is formed during TFA-mediated cleavage of azide-containing peptides from solid support. This study identifies this byproduct, provides a rationale for its formation and a solution for its inhibition.

Method

NMR and HRMS analyses as well as chemical synthesis is employed to identify the byproduct and probe the mechanism of its formation.

Results

Data is consistent with the conversion of azide to methylamine which occurs during peptide cleavage likely via a Schmidt rearrangement involving nucleophilic azide attack of t-butyl cations generated from the side chain deprotection of Boc- and t-butyl ether groups.

Conclusion

Installing azide-containing residues using the newly reported 2-(trimethylsilyl)ethoxycarbonyl (Teoc)-protected compound 3a proved effective at significantly thwarting the formation of methylamine byproduct.