Antioxidant Activity of Quinoxalyl Hydrazones of 2-Hydroxyimino-1,3-dicarbonyl Compounds

Biosimilarity and pharmacokinetic descriptors were obtained using SwissADME and ADMETlab 2.0 web ser-vices. Analysis of the obtained descriptors shows that, according to Lipinski's rule, quinoxalyl hydrazones of 2-hydroximino-1,3-dioxocompounds may be promising candidates for drug development for oral administration. Analysis of the pharmacokinetic descriptors of the structures studied shows that, according to the in silico predic-tions, the compounds can penetrate the blood-brain barrier, be absorbed in the gastrointestinal tract, bind to plasma proteins, be rapidly eliminated from target cells and inhibit CYP3A4, CYP1A2, CYP2C19 and CYP2D6 isoenzymes. The antioxidant activity of quinoxalyl hydrazone derivatives with different benzoyl, ester and acetyl moieties has been studied. Pharmacological screening of the obtained compounds was performed in vitro in the model of Fe2+-induced lipid peroxidation. The data of pharmacological screening indicate clearly pronounced in-hibition of lipid peroxidation in the system of yolk lipoproteins by the compounds obtained, which indicates a significant contribution of quinoxalone scaffold in the manifestation of antioxidant properties. Variations in the structure of the starting 1,3-dicarbonyl compounds did not result in significant changes in the antioxidant activ-ity of the obtained hydrazones. The compounds obtained can be promising compounds with marked antioxidant activity for further in vivo studies, including investigation of acute and chronic toxicity. The leading compound is tolyl-substituted quinoxalyl hydrazone IIb.