Related Experiment Videos
Conformational analysis of the antimalarial agent quinidine
T H Silva1, A B Oliveira, W B De Almeida
1Departamento de Produtos Farmacêuticos, Faculdade de Farmácia da UFMG, Brazil.
Bioorganic & Medicinal Chemistry
|February 1, 1997
Summary
This study explored quinidine's molecular conformations using computational methods. Results reveal multiple stable structures, supporting experimental evidence of quinidine existing in different forms in solution.
Area of Science:
- Medicinal Chemistry
- Computational Chemistry
- Pharmacology
Background:
- Quinidine, an antimalarial drug derived from Cinchona bark, exhibits activity variations linked to stereochemistry.
- Detailed conformational analysis is crucial for understanding biologically active molecules.
Purpose of the Study:
- To comprehensively investigate the potential energy surface (PES) of quinidine.
- To characterize the minimum energy conformations and thermodynamic properties of quinidine.
Main Methods:
- Utilized molecular mechanics (MM) and semiempirical quantum mechanical methods (AM1, PM3).
- Performed harmonic frequency analysis to confirm true minima.
- Located transition state (TS) structures to analyze conformational interconversion.
Main Results:
- Identified six distinct minimum energy conformations for quinidine.
- Reported relative stabilities and thermodynamic properties of these conformers.
- Provided theoretical basis for the coexistence of multiple quinidine conformers in solution.
Conclusions:
- Theoretical findings align with experimental NMR data suggesting two conformations of quinidine in solution.
- This study offers novel insights into quinidine's conformational landscape and its implications for antimalarial activity.