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
作者:Roberta Bernini、Maurizio Barontini、Pasquale Mosesso、Gaetano Pepe、Stefan M. Willför、Rainer E. Sjöholm、Patrik C. Eklund、Raffaele Saladino
DOI:10.1039/b822661j
日期:——
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.
我们在此报道了首次选择性去-O-甲基化一大批桂皮醇木质素,利用IBX作为主要氧化剂,在绿色条件下(碳酸二甲酯-H2O溶剂)通过原位还原程序转化为相应的儿茶酚衍生物。研究了儿茶酚基团对新木质素衍生物的细胞毒性和基因毒性的影响。获得的结果表明,儿茶酚基团的存在显著增强了致断裂潜力(例如,诱导染色体畸变)、细胞毒性以及细胞周期进程的调节,相较于母体化合物。因此,尽管通常描述儿茶酚衍生物具有体外抗氧化活性,我们的结果首次显示出其具有致断裂潜力,这在很大程度上指示了长期的遗传和癌症风险。