Selective modification of tryptophan in polypeptides via C-N coupling with azoles using in situ-generated iodine-based oxidants in aqueous media

This study demonstrates the C-N coupling of tryptophan with azoles, promoted by an in situ-generated iodine-based oxidant. The protocol was successfully applied to the selective modification of tryptophan in nonprotected polypeptide bearing oxidatively sensitive residues in acidic aqueous media. The present method allows the attachment of reactive handles to polypeptides and the peptide stapling.

Automated summary

This study demonstrates a method for C-N coupling of tryptophan with azoles using an in situ-generated iodine-based oxidant. It allows selective modification of tryptophan in nonprotected polypeptides bearing oxidatively sensitive residues. This method enables the attachment of reactive handles to polypeptides and peptide stapling.