Chen G, Warren JD, Chen J, Wu B, Wan Q, Danishefsky SJ. Studies related to the relative thermodynamic stability of C-terminal peptidyl esters of O-hydroxy thiophenol: emergence of a doable strategy for non-cysteine ligation applicable to the chemical synthesis of glycopeptides.
J Am Chem Soc 2007;
128:7460-2. [PMID:
16756298 DOI:
10.1021/ja061588y]
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Abstract
A pathway has been devised, wherein a phenolic ester of a C-terminal peptide is ligated with an N-terminal peptide through two consecutive acyl migrations. In the first transacylation, the C-terminus is transferred from a phenol to a newly liberated ortho-thiol function. Subsequently, the acyl group is transported to a proximal benzylamine through a six-membered transition state.
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