Chalcones featuring an analgesic/anti-inflammatory pharmacophore, i.e., the 2(3H)-benzoxazolone heterocycle, on the one hand, and a radical scavenger moiety, i.e., 2,6-di-t-butylphenol, on the other hand were synthesized by condensation of a ketone 2(3H)-benzoxazolone precursor with 3,5-di-t-butyl-4-hydroxybenzaldehyde. Among the various methods explored (acid homogenous or heterogenous catalysis, base catalysis), heterogenous catalysis conditions using KSF Montmorillonite were found to be the most convenient. The E-geometry of the soobtained chalcones was ascertained both by 1 H and 13 C-nuclear magnetic resonance (NMR) spectroscopy as well as B3LYP/6-31G ** quantum mechanics calculations. Chalcones 1-8 were pharmacologically evaluated in vitro for their ability to prevent human low-density lipoprotein (LDL) copper-induced oxidation using Cu 2? as oxidizing agent. Compound 4 emerged as the most promising agent as it was able to inhibit copper-mediated human LDL oxidation with an activity ten times greater than that of Probucol, a reference antioxidant drug.
Le romarin (Rosmarinus officinalis)est une espèce très abondante dans la région de Hammamet de la wilaya de Tébessa à l'Est algérien, il est utilisé en médecine populaire, cosmétique et phytopharmacie. L’extraction des huiles essentielles du romarin a été effectuée par entraînement à la vapeur d’eau. L’étude chimique de ces huiles essentielles par CPG-SM a révélé la richesse de ces dernières en 1,8 cinéole par rapport aux autres composés. L’activité des huiles essentielles de Rosmarinus officinalis sur trois souches bactériennes pathogènes (Staphylococcus aureus, Escherichia coli, Acinetobacter sp.) par la technique d’aromatogramme montre que le pouvoir antimicrobien de ces huiles est très important et se caractérise par une action bactéricide contre les germes suscités.
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