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Two-Dimensional Barriers for Probing Conformational Shifts in Macrocycles.
Shinya Kobori1, Sungjoon Huh1, Solomon D Appavoo1
1Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario Canada, M5S 3H6.
Researchers developed tunable composite barriers in macrocyclic backbones using heterocyclic rearrangements. This method controls conformation and offers insights for new conformational control elements.
Area of Science:
- Organic Chemistry
- Supramolecular Chemistry
- Chemical Synthesis
Background:
- Macrocyclic compounds are crucial in various chemical and biological applications.
- Controlling macrocyclic conformation is essential for their function.
- Heterocyclic rearrangements offer novel strategies for molecular design.
Purpose of the Study:
- To develop and utilize composite two-dimensional barriers within macrocyclic backbones.
- To investigate the influence of heterocycle translocation on macrocyclic conformation.
- To explore the Boulton-Katritzky reaction as a method for creating composite barriers.
Main Methods:
- Synthesis of composite two-dimensional barriers in macrocyclic systems.
- Kinetic studies using proton nuclear magnetic resonance (¹H NMR) spectroscopy.
- Molecular dynamics (MD) simulations and NMR analysis.
Main Results:
- The Boulton-Katritzky reaction was employed to create tunable composite barriers.
- In-plane atom movement was found to be rapid in 17-19 membered rings, slowing in 16-membered rings.
- NMR and MD simulations confirmed the persistence of rare cis-amide motifs during conformational changes.
Conclusions:
- Heterocyclic rearrangement reactions effectively control macrocyclic backbones.
- The study provides fundamental insights into conformational control elements.
- Findings may guide the development of novel molecular systems with tailored conformations.
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