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On‐Resin Preparation of Allenamidyl Peptides: A Versatile Chemoselective Conjugation and Intramolecular Cyclisation Tool
Author(s) -
Cameron Alan J.,
Harris Paul W. R.,
Brimble Margaret A.
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202004656
Subject(s) - intramolecular force , moiety , bioconjugation , chemistry , click chemistry , peptide , combinatorial chemistry , disulfide bond , cysteine , chemoselectivity , thiol , organic chemistry , catalysis , biochemistry , enzyme
The ability to modify peptides and proteins chemoselectively is of continued interest in medicinal chemistry, with peptide conjugation, lipidation, stapling, and disulfide engineering at the forefront of modern peptide chemistry. Herein we report a robust method for the on‐resin preparation of allenamide‐modified peptides, an unexplored functionality for peptides that provides a versatile chemical tool for chemoselective inter‐ or intramolecular bridging reactions with thiols. The bridging reaction is biocompatible, occurring spontaneously at pH 7.4 in catalyst‐free aqueous media. By this “click” approach, a model peptide was successfully modified with a diverse range of alkyl and aryl thiols. Furthermore, this technique was demonstrated as a valuable tool to induce spontaneous intramolecular cyclisation by preparation of an oxytocin analogue, in which the native disulfide bridge was replaced with a vinyl sulfide moiety formed by thia‐Michael addition of a cysteine thiol to the allenamide handle.