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Issue 1, 2014
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Chemoselective sulfenylation and peptide ligation at tryptophan

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Peptide ligation–desulfurization chemistry at 2-thiol tryptophan (Trp) is described for the first time. Installation of a thiol auxiliary was achieved through late-stage chemoselective sulfenylation chemistry at the 2-position of the indole ring of Trp either in solution or on solid support, thus abrogating the need for the preparation of a pre-formed thiolated amino acid. Peptides possessing the 2-thiol Trp functionality on the N-terminus were shown to facilitate high yielding ligation reactions with a variety of C-terminal peptide thiophenyl thioesters. Efficient removal of the 2-thiol Trp auxiliary following the ligation reactions was achieved via reductive desulfurization and provided native peptide products in excellent yields. The utility of the methodology was demonstrated in the synthesis of a glycosylated fragment of the N-terminal extracellular domain of the chemokine receptor CXCR1.

Graphical abstract: Chemoselective sulfenylation and peptide ligation at tryptophan

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The article was received on 28 May 2013, accepted on 09 Oct 2013 and first published on 10 Oct 2013

Article type: Edge Article
DOI: 10.1039/C3SC51497H
Chem. Sci., 2014,5, 260-266

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    Chemoselective sulfenylation and peptide ligation at tryptophan

    L. R. Malins, K. M. Cergol and R. J. Payne, Chem. Sci., 2014, 5, 260
    DOI: 10.1039/C3SC51497H

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