Synthesis and Structure/Antioxidant Activity Relationship of Novel Catecholic Antioxidant Structural Analogues to Hydroxytyrosol and Its Lipophilic Esters
A large panel of novel catecholic antioxidants and their fatty acid or methyl carbonate esters has been synthesized in satisfactory to good yields through a 2-iodoxybenzoic acid (IBX)-mediated aromatic hydroxylation as the key step. The new catechols are structural analogues of naturally occurring hydroxytyrosol (3,4-DHE). To evaluate structure/activity relationships, the antioxidant properties of all catecholic compounds were evaluated in vitro by ABTS assay and on whole cells by DCF fluorometric assay and compared with that of the corresponding already known hydroxytyrosyl derivatives. Results outline that all of the new catechols show antioxidant capacity in vitro higher than that of the corresponding hydroxytyrosyl derivatives. Less evident positive effects have been detected in whole cells experiments. Cytotoxicity experiments, using MTT assay, on a representative set of compounds evidenced no influence in cell survival.
Synthesis and evaluation of antiproliferative activity of a novel series of hydroxychavicol analogs
作者:Yogesh Yadav、Eric A. Owens、Vibhuti Sharma、Ritu Aneja、Maged Henary
DOI:10.1016/j.ejmech.2014.01.016
日期:2014.3
regulators: 1) unlike the hydroxyl substituent at position-4, the position-3 hydroxyl is vital for enhanced activity 2) acetoxyl groups are dispensable for activity as corroborated earlier by others 3) allylic doublebonds at 2′C–3′C serve to positively influence antiproliferative activity 4) long saturated side chains at 1′-position negatively regulate antiproliferative activity and 5) maneuvering position-4