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Exploring Metal-Free Click Reactions: New Frontiers in Glycochemistry and Bioconjugation
Pedro Ramírez-López1, José Ramón Suárez1, Aida Flores1
1Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Plz. Ramón y Cajal s/n, Madrid, C.P. 28040, España.
Bioconjugate Chemistry
|July 17, 2025
Summary
Metal-free click chemistry offers efficient and biocompatible methods for synthesizing vital glycoconjugates. Four key reactions—thiol-ene coupling, SPAAC, IEDDA, and SuFEx—are revolutionizing drug development and diagnostics.
Area of Science:
- Glycochemistry and Glycobiology
- Biomedical Applications
- Chemical Biology
Background:
- Glycoconjugates are crucial for cellular processes and implicated in various diseases.
- Traditional synthesis methods often lack efficiency and biocompatibility.
- Metal-free click chemistry provides selective and mild alternatives for glycoconjugate synthesis.
Purpose of the Study:
- To review advancements in metal-free click chemistry for glycoconjugate synthesis.
- To highlight the applications of specific click reactions in biomedicine.
- To underscore the impact of these methods on glycochemistry and glycobiology.
Main Methods:
- Review of four metal-free click reactions: thiol-ene coupling (TEC), strain-promoted azide-alkyne cycloaddition (SPAAC), inverse electron-demand Diels-Alder (IEDDA), and sulfur fluoride exchange (SuFEx).
- Discussion of the mechanisms and applications of each reaction in synthesizing diverse glycoconjugates.
- Exploration of the integration of these reactions with biocatalysis and other techniques.
Main Results:
- TEC enables regio- and stereoselective synthesis for vaccines and therapeutics.
- SPAAC facilitates in vivo imaging, glycan monitoring, and targeted protein degradation.
- IEDDA is key for metabolic glycoengineering, live-cell imaging, and biomaterials.
- SuFEx expands the functionalization of glycoconjugates and proteins.
Conclusions:
- Metal-free click chemistry reactions are transforming glycoconjugate synthesis.
- These methods offer biocompatible and efficient routes for therapeutic and diagnostic applications.
- Advancements in glycochemistry and glycobiology are accelerating progress in medicine and materials science.
