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Conformational Evolution of Bicalutamide in Chloroform: A Comprehensive NMR Study.
Konstantin V Belov1, Ilya A Khodov1,2
1G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, Ivanovo 153045, Russia.
Researchers studied bicalutamide conformation using NOE NMR. Findings reveal that molecules transition to a «closed» conformation at low concentrations, influencing nucleation and solid-phase formation.
Area of Science:
- Chemical Physics
- Molecular Biology
- Crystallography
Background:
- Bicalutamide is a nonsteroidal antiandrogen blocker.
- Understanding molecular conformation is crucial for drug development.
- Conformational mobility influences nucleation and solid-phase formation.
Purpose of the Study:
- To investigate the conformational mobility of bicalutamide in deuterated chloroform.
- To quantify the distribution of «open» and «closed» conformers in various conditions.
- To elucidate the role of concentration and solid phase in bicalutamide's conformational evolution.
Main Methods:
- Nuclear Overhauser Effect (NOE) NMR spectral analysis.
- Quantitative analysis of conformer distribution.
- Investigation across four systems: solid phase, no solid phase, and two diluted solutions.
Main Results:
- A significant population of «closed» conformers was observed in all studied systems.
- The «closed» conformation is favored at low concentrations and persists until solid phase formation.
- Conformer distribution varied across systems: solid phase (16.7%/83.3%), no solid phase (19.7%/80.3%), diluted solutions (16.1%/83.9% and 85.3%/14.7%).
Conclusions:
- Molecular preparation for nucleation involves a transition to the «closed» conformation.
- This conformational behavior challenges previous assumptions about solid-phase influence on solution conformation.
- Bicalutamide serves as a model for understanding conformational evolution during nucleation in small molecules.
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