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Copper-Free Sonogashira Cross-Coupling for Functionalization of Alkyne-Encoded Proteins in Aqueous Medium and in Bacterial Cells

Open access
Li, Nan, Lim, Reyna K. V., Edwardraja, Selvakumar, Lin, Qing·2011·Journal of the American Chemical Society

Abstract

Bioorthogonal reactions suitable for functionalization of genetically or metabolically encoded alkynes, for example, copper-catalyzed azide-alkyne cycloaddition reaction ("click chemistry"), have provided chemical tools to study biomolecular dynamics and function in living systems. Despite its prominence in organic synthesis, copper-free Sonogashira cross-coupling reaction suitable for biological applications has not been reported. In this work, we report the discovery of a robust aminopyrimidine-palladium(II) complex for copper-free Sonogashira cross-coupling that enables selective functionalization of a homopropargylglycine (HPG)-encoded ubiquitin protein in aqueous medium. A wide range of aromatic groups including fluorophores and fluorinated aromatic compounds can be readily introduced into the HPG-containing ubiquitin under mild conditions with good to excellent yields. The suitability of this reaction for functionalization of HPG-encoded ubiquitin in Escherichia coli was also demonstrated. The high efficiency of this new catalytic system should greatly enhance the utility of Sonogashira cross-coupling in bioorthogonal chemistry.

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Metadata

Authors
Li, N., Lim, R. K. V., Edwardraja, S., & Lin, Q.
Venue
Journal of the American Chemical Society
Published
2011-09-13
Volume
133
Issue
39
Pages
15316-15319
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2051171377
Cited by
266
References
4
FWCI
9.73
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Copper-Free Sonogashira Cross-Coupling for Functionalization of Alkyne-Encoded Proteins in Aqueous Medium and in Bacterial Cells. https://app.cochat.ai/papers/10.1021/ja2066913
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Li, N., Lim, R. K. V., Edwardraja, S., & Lin, Q. (2011). Copper-Free Sonogashira Cross-Coupling for Functionalization of Alkyne-Encoded Proteins in Aqueous Medium and in Bacterial Cells. Journal of the American Chemical Society. https://doi.org/10.1021/ja2066913

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