Structure determination of the anorexic agent mazindol

Area of Science:

• Chemical structure elucidation
• Spectroscopy
• Pharmacology

Background:

• Mazindol is an anorexic agent.
• Understanding the tautomeric forms of drugs is crucial for their efficacy and stability.
• Previous studies have not definitively characterized the solid-state tautomer of mazindol.

Purpose of the Study:

• To determine the predominant tautomeric form of mazindol in solution and solid states.
• To confirm the solid-state structure of mazindol using spectroscopic methods.

Main Methods:

• Nuclear magnetic resonance (NMR) spectroscopy to analyze solution state.
• Diffuse UV reflectance spectroscopy to analyze solid state.

Main Results:

• Mazindol was identified as the carbinolamine tautomer (5-p-chlorophenyl-2,3-dihydro-5H-imidazol[2,1-a]isoindol-5-ol) in solution.
• Diffuse UV reflectance spectroscopy confirmed this carbinolamine tautomer exists in the solid state.

Conclusions:

• Mazindol predominantly exists as the carbinolamine tautomer in both solution and solid forms.
• The structural characterization provides a basis for understanding mazindol's pharmacological activity and stability.