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Chemoselective Modification of Viral Surfaces via Bioorthogonal Click Chemistry
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Chemoselective sequential "click" ligation using unsymmetrical bisazides.

Zhao Yuan1, Gui-Chao Kuang, Ronald J Clark

  • 1Department of Chemistry and Biochemistry, Florida State University , Tallahassee, Florida 32306-4390, United States.

Organic Letters
|May 8, 2012
PubMed
Summary

Chemoselective three-component reactions enable the synthesis of bistriazole molecules from unsymmetrical bisazides and two different alkynes. This copper-catalyzed process offers high regioselectivity in aqueous solutions, suitable for bioconjugation.

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Area of Science:

  • Organic Chemistry
  • Click Chemistry
  • Catalysis

Background:

  • Copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) is a powerful click chemistry reaction.
  • Unsymmetrical bisazides offer potential for complex molecule synthesis but require selective reaction strategies.

Purpose of the Study:

  • To develop a chemoselective method for synthesizing bistriazole molecules using unsymmetrical bisazides.
  • To exploit the reactivity difference between aromatic and aliphatic alkynes for regioselective synthesis.
  • To assess the applicability of the method in aqueous media for bioconjugation.

Main Methods:

  • Utilizing unsymmetrical bisazides with chelating and nonchelating azido groups.
  • Employing copper(I)-catalyzed three-component reactions with two distinct alkyne molecules.
  • Performing reactions in a single reaction container under aqueous, neutral pH conditions.

Main Results:

  • Achieved chemoselective conjugation of bisazides with two different alkynes.
  • Generated bistriazole molecules with excellent regioselectivity.
  • Demonstrated applicability in aqueous solutions at neutral pH.

Conclusions:

  • Developed a versatile and regioselective method for bistriazole synthesis.
  • The reaction conditions are compatible with bioconjugation applications.
  • Highlights the utility of exploiting reactivity differences in click chemistry.