May 28, 2009Angewandte Chemie International Edition
Click Chemistry beyond Metal‐Catalyzed Cycloaddition
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Implication
Narrative review evaluates metal-free click reactions across chemical synthesis and bioconjugation, highlighting biocompatible pathways that eliminate toxic copper catalysts.
Key Points
- To evaluate the synthetic scope, advantages, and limitations of metal-free click chemistry reactions as alternatives to the copper-catalyzed azide-alkyne cycloaddition.
- Reviewed synthetic mechanisms and performance profiles for non-metal click chemistries, including thiol-ene radical additions, Diels–Alder couplings, and Michael additions.
- Evaluated reaction yields, operational simplicity, and physiological compatibility across small-molecule synthesis, polymer chemistry, and bioconjugation.
- Demonstrated that metal-free [3+2] cycloadditions, Diels–Alder reactions, and thiol-alkene additions achieve high product yields through straightforward, robust procedures.
- Established that removing transition metal catalysts confers high physiological compatibility, broadening applications in biomacromolecule synthesis and live-cell bioconjugation.
Cite This Study
Becer et al. (2009) studied this question.