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A selective de-O-methylation of guaiacyl lignans to corresponding catechol derivatives by 2-iodoxybenzoic acid (IBX). The role of the catechol moiety on the toxicity of lignans

2009; Royal Society of Chemistry; Volume: 7; Issue: 11 Linguagem: Inglês

10.1039/b822661j

1477-0539

Roberta Bernini, Maurizio Barontini, Pasquale Mosesso, Gaetano Pepe, Stefan Willför, Rainer Sjöholm, Patrik Eklund, Raffaele Saladino,

Cholinesterase and Neurodegenerative Diseases

We report here the first selective de-O-methylation of a large panel of guaiacyl lignans to the corresponding catechol derivatives by using IBX as primary oxidant under green conditions (dimethyl carbonate–H2O solvent) through an in situreduction procedure. The influence of the catechol moiety on the cytotoxicity and genotoxicity of new lignan derivatives has been investigated. The results obtained indicated that the presence of the catechol moiety sharply enhances the clastogenic potential (e.g. induction of chromosomal aberrations), the cytotoxicity and the modulation of cell cycle progression with respect to the parent compounds. Thus, despite the in vitroantioxidant activity usually described for catechol derivatives, our results show for the first time the generation of a clastogenic potential, highly indicative of a long-term genetic and cancer risk.