Ring-substituted 4-hydroxy-1H-quinolin-2-ones: preparation and biological activity

Area of Science:

• Medicinal Chemistry
• Plant Physiology
• Mycology

Background:

• 4-hydroxy-1H-quinolin-2-one derivatives are a class of compounds with potential biological activities.
• Understanding the relationship between chemical structure, lipophilicity, and biological activity is crucial for drug discovery.
• Photosynthesis inhibition and antifungal activity are important areas of research for agricultural and pharmaceutical applications.

Purpose of the Study:

• To synthesize and characterize a series of novel ring-substituted 4-hydroxy-1H-quinolin-2-one derivatives.
• To evaluate the photosynthesis-inhibiting activity of these derivatives using spinach chloroplasts.
• To assess the in vitro antifungal activity of the synthesized compounds against various fungal strains.

Main Methods:

• Synthesis of twelve 4-hydroxy-1H-quinolin-2-one derivatives.
• Reverse-phase high-performance liquid chromatography (RP-HPLC) for lipophilicity determination.
• In vitro screening of compounds for photosynthesis-inhibiting activity using spinach chloroplasts and antifungal activity against eight fungal strains.

Main Results:

• All synthesized compounds were characterized.
• Lipophilicity of the compounds was determined and correlated with their chemical structures.
• Structure-activity relationships (SAR) were discussed for both photosynthesis-inhibiting and antifungal activities.

Conclusions:

• The study successfully synthesized and evaluated novel 4-hydroxy-1H-quinolin-2-one derivatives for biological activity.
• Established correlations between lipophilicity, chemical structure, and observed activities provide insights for further development.
• The findings contribute to the understanding of SAR for photosynthesis inhibition and antifungal properties in this chemical class.