Hydrophilic BIPHEPHOS Ligand for Pd-Mediated Cysteine Allylation of Peptides and Proteins in Water
Thomas Schlatzer, Julia Kriegesmann, Mark Bieber, Christian F. W. Becker, Rolf Breinbauer

TL;DR
A new water-soluble ligand enables efficient modification of peptides and proteins under biocompatible conditions.
Contribution
A hydrophilic BIPHEPHOS ligand with diethyl phosphonates is introduced for aqueous Pd-mediated cysteine allylation.
Findings
The hydrophilic BIPHEPHOS ligand is catalytically isofunctional to unpolar tert-butyl.
Native prenyl groups and bioconjugation handles were successfully introduced into peptides and proteins.
The method works under nearly aqueous conditions, improving biocompatibility.
Abstract
The selective and natural post-translational modification of peptides and proteins under biocompatible conditions remains a challenge. Herein, we report a hydrophilic variant of the BIPHEPHOS ligand featuring diethyl phosphonates as solubilizing groups, which were found to be catalytically isofunctional to unpolar tert-butyl. This enabled the fast introduction of native prenyl groups and bioconjugation handles into peptides and folded proteins under nearly aqueous conditions.
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Taxonomy
TopicsClick Chemistry and Applications · Catalytic Cross-Coupling Reactions · Organophosphorus compounds synthesis
