Examinando por Autor "Baeza, Evelyn"

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    Ítem
    Synthesis and DPPH radical scavenging activity of prenylated phenol derivatives
    (MDPI, 2012-01) Osorio, Mauricio; Aravena, Jacqueline; Vergara, Alejandra; Taborga, Lautaro; Baeza, Evelyn; Catalán, Karen; González, Cesar; Carvajal, Marcela; Carrasco, Héctor; Espinoza, Luis
    The synthesis of twenty six prenylated phenols derivatives is reported. These compounds were obtained under mild conditions via Electrophilic Aromatic Substitution (EAS) coupling reactions between phenol derivatives containing electron-donor subtituents and 3-methyl-2-buten-1-ol using BF 3·OEt 2. Dialkylations were also produced with this method. The formation of a chroman ring by intramolecular cyclization between a sp 2 carbon from the prenyl group with the hydroxyl substituent in the ortho position occurred with some phenols. All the synthesized compounds were evaluated as antioxidants according to a DPPH radical scavenging activity assay. IC 50 values of five synthesized compounds indicated they were as good antioxidants as Trolox™. © 2012 by the authors.
  • Miniatura
    Ítem
    SYNTHESIS OF GERANYLHYDROQUINONE DERIVATIVES WITH POTENCIAL CYTOTOXIC ACTIVITY
    (Sociedade Brasileira de Química, 2012) Baeza, Evelyn; Catalan, karen; Peña-Cortes, Hugo; Espinoza, Luis
    Natural geranylhydroquinone 1 and geranyl-p-methoxyphenol 2 were prepared by Electrophilic Aromatic Substitution (EAS) reactions between geraniol and 1,4-hydroquinone or p-methoxyphenol respectively, using BF3∙Et2O as a catalyst. Furthermore, natural geranylquinone 3, geranyl-1,4-dimethoxyquinone 4 and the new geranyl-4-methoxyphenyl acetate 5 were obtained by chemical transformations of 1 and 2. The compounds were evaluated for their in vitro cytotoxicity activities against cultured human cancer cells of PC-3 human prostate cancer, MCF-7 and MDA-MB-231 breast carcinoma, and Dermal Human Fibroblasts DHF. IC50 values were in the µM range.