QSAR of genotoxic active benzazoles

Area of Science:

• Medicinal Chemistry
• Toxicology
• Computational Chemistry

Background:

• Benzoxazole and benzimidazole scaffolds are prevalent in biologically active molecules.
• Genotoxicity assessment is crucial for drug development and chemical safety.
• Understanding structure-activity relationships aids in designing safer and more effective compounds.

Purpose of the Study:

• To evaluate the genotoxic potential of synthesized 2,5-disubstituted benzoxazole and benzimidazole derivatives.
• To identify key structural features contributing to genotoxic activity.
• To establish structure-activity relationships (SAR) for genotoxicity in these compound classes.

Main Methods:

• The Bacillus subtilis rec-assay was employed to screen synthesized compounds for genotoxicity.
• Quantitative Structure-Activity Relationship (QSAR) analysis was performed.
• Quantum chemical parameters were calculated and correlated with observed activity.

Main Results:

• 5-methyl-2-(p-aminobenzyl)benzoxazole demonstrated the highest genotoxic response, comparable to the positive control 4-nitroquinoline 1-oxide (4-NQO).
• Four other derivatives also exhibited significant genotoxic activity.
• QSAR analysis identified specific structural (IY(C(2)H(4)), IY(CH(2)O)) and quantum chemical (DeltaE) parameters influencing genotoxicity.
• Substituent effects at R and R(1) positions, particularly electron-donating groups at R and bulky alkyl groups at R(1), enhanced genotoxicity.

Conclusions:

• The study successfully identified potent genotoxic benzoxazole and benzimidazole derivatives.
• Structural and electronic features significantly modulate the genotoxic activity of these compounds.
• Findings provide a basis for the rational design of related compounds, considering their genotoxic potential.