Free radical oxidation of 15-(S)-hydroxyeicosatetraenoic acid with the Fenton reagent: characterization of an epoxy-alcohol and cytotoxic 4-hydroxy-2E-nonenal from the heptatrienyl radical pathway
作者:P. Manini、S. Briganti、C. Fabbri、M. Picardo、A. Napolitano、M. d’Ischia
DOI:10.1016/j.chemphyslip.2006.02.015
日期:2006.7
diazomethane allowed isolation of another main product which could be identified as methyl (5Z,8Z,13E)-11,12-trans-epoxy-15-hydroxy-5,8,13-eicosatrienoate (2a methyl ester, 8% yield). A similar oxidation carried out on (15-(2)H)-15-HETE (1b) indicated complete retention of the label in 2b methyl ester and 3b, consistent with an oxidation pathway involving as the primary event H-atom abstraction at C-10. Overall
用Fenton试剂(Fe2 + / EDTA / H2O2)氧化(5Z,8Z,11Z,13E,15S)-15-羟基-5,8,11,13-二十碳四烯酸(15-(S)-HETE,1a) )进行了调查。在pH 7.4的磷酸盐缓冲液中,反应进行1小时后消耗了75%的底物,得到了一种混合物,其中一种被鉴定为(2E,4S)-4-hydroxy-2-nonenal(3a,收率18% )。将混合物与重氮甲烷甲基化,可以分离出另一种主要产物,该产物可以鉴定为(5Z,8Z,13E)-11,12-反式环氧-15-羟基-5,8,13-二十碳三烯酸甲酯(2a甲基酯, 8%的产率)。在(15-(2)H)-15-HETE(1b)上进行的类似氧化反应表明标记完全保留在2b甲酯和3b中,与氧化路径有关,该路径涉及C为H原子的主要事件-10。全面的,