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Controlling cyclodextrin host-guest complexation in water with dynamic pericyclic chemistry
Marius Gaedke1, Anja Ramström1, Daisy R S Pooler1
1Department of Chemistry, KTH Royal Institute of Technology, Stockholm, Sweden.
Communications Chemistry
|December 26, 2025
Summary
Researchers used dynamic pericyclic chemistry to control molecular recognition in water. This Diels-Alder reaction allows reversible modification of cyclodextrin guests, enabling applications like molecular switches and drug delivery.
Area of Science:
- Supramolecular Chemistry
- Organic Chemistry
Background:
- Water-soluble macrocycles, like cyclodextrins, are vital for applications including drug delivery and water purification.
- Controlling host-guest interactions of macrocycles under physiological conditions remains a significant challenge.
Purpose of the Study:
- To demonstrate the use of dynamic pericyclic chemistry for modifying macrocycle guests under mild, aqueous conditions.
- To enable precise control over host-guest chemistry for applications in molecular recognition and stimuli-responsive systems.
Main Methods:
- Utilized the Diels-Alder [4+2] cycloaddition reaction between anthracene derivatives and activated alkenes in water.
- Investigated the reversibility of the reaction and its impact on cyclodextrin binding.
- Explored the use of alkene scavengers to trigger retro-Diels-Alder reactions.
Main Results:
- The Diels-Alder reaction proceeded rapidly, selectively, and reversibly in water under ambient conditions.
- Demonstrated modulation of binding between cyclodextrins and anthracene derivatives.
- Showcased the potential for creating non-equilibrium steady state chemical reaction networks.
Conclusions:
- Dynamic pericyclic chemistry offers a powerful method to control and switch molecular recognition in aqueous environments.
- The reversible Diels-Alder reaction system can be employed as a molecular switch for tunable host-guest interactions.
- This approach has significant implications for developing advanced materials and drug delivery systems.
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