Radical-mediated click-clip reactions

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Polymer Chemistry

Background:

• Click reactions offer efficient and selective molecular coupling but typically lack reversibility.
• Reversible click reactions are highly desirable for dynamic molecular systems and on-demand transformations.
• Developing strategies for reversible bond formation and cleavage is crucial for advanced synthesis.

Purpose of the Study:

• To establish a novel reversible click reaction pair based on sulfilimine chemistry.
• To demonstrate the precise and on-demand cleavage of the formed sulfilimine linkage.
• To explore the utility of this click-clip sequence in complex molecular architectures.

Main Methods:

• Oxidative sulfilimine bond formation between phenothiazines and amines using N-bromosuccinimide.
• Photoreductive cleavage of the sulfilimine bromide linkage at 380 nanometers.
• Application of the reversible reaction in synthesizing depolymerizable macromolecules and modifying aminosaccharides.

Main Results:

• Rapid and quantitative coupling of phenothiazines and amines via oxidative sulfilimine formation.
• High-yield, quantitative reversion of sulfilimine bromides to starting materials upon photoreduction.
• Demonstrated selectivity and efficiency in complex systems, including depolymerizable polymers and aminosaccharides.

Conclusions:

• A novel sulfilimine-based click-clip reaction pair has been successfully developed.
• The protocol enables precise, on-demand cleavage, significantly expanding the versatility of click chemistry.
• This reversible strategy holds promise for advanced materials science and chemical biology applications.