RM values of naphthols and acetophenones in structure-activity studies

Area of Science:

• Chromatographic science
• Medicinal chemistry
• Structure-activity relationships

Background:

• Chromatography is crucial for separating and analyzing chemical compounds.
• Partition coefficients (log P) are key indicators of a compound's lipophilicity and biological behavior.
• Understanding structure-activity relationships (SAR) is vital for drug design and toxicity assessment.

Purpose of the Study:

• To evaluate the correlation between chromatographic retention values (RM) and partition coefficients (log P) using different stationary phases.
• To investigate the utility of silicone oil-impregnated silica gel chromatography for predicting lipophilicity.
• To establish structure-activity relationships for hemolytic activity and acute toxicity based on chromatographic and lipophilic data.

Main Methods:

• Thin-layer chromatography (TLC) was performed using silica gel G layers impregnated with silicone oil as the stationary phase.
• Retention values (RM) were determined for series of naphthols and acetophenones.
• RM values were compared with log P values obtained from octanol-water systems.
• Statistical analysis was used to establish equations for structure-activity relationships.

Main Results:

• RM values obtained on silicone oil-impregnated silica gel showed a stronger correlation with log P values compared to those determined on polyamide layers.
• This improved correlation was observed for both naphthols and acetophenones.
• Developed quantitative structure-activity relationship (QSAR) equations highlighted the significance of lipophilicity and halogen substitution in predicting compound activity.

Conclusions:

• Silicone oil-impregnated silica gel chromatography provides a reliable method for estimating compound lipophilicity (log P).
• The established SAR equations demonstrate that lipophilic character and halogenation are critical determinants of hemolytic activity and acute toxicity.
• This chromatographic approach offers a valuable tool for preliminary assessment of compound properties in drug discovery and toxicology.