Tertiary amine-based glutathione peroxidase mimics: some insights into the role of steric and electronic effects on antioxidant activity
作者:Debasish Bhowmick、Govindasamy Mugesh
DOI:10.1016/j.tet.2012.09.020
日期:2012.12
In this work, several tertiary amine-based diaryl diselenides were synthesized and evaluated for their glutathione peroxidase (GPx)-like antioxidant activities using hydrogen peroxide, tert-butyl hydroperoxide and cumene hydroperoxide as substrates and thiophenol (PhSH) and glutathione (GSH) as co-substrates. A comparison of the GPx-like activity of 4-methoxy-substituted N,N-dialkylbenzylamine-based
在这项工作中,合成了几种叔胺基二芳基二硒化物,并以过氧化氢,叔丁基氢过氧化物和枯烯氢过氧化物为底物,以硫酚(PhSH)和谷胱甘肽(GSH)为底物,评估了它们的类谷胱甘肽过氧化物酶(GPx)的抗氧化活性。共同的底物。4-甲氧基取代的N,N的GPx样活性的比较基于-二烷基苄胺的二硒化物与相应的6-甲氧基取代的化合物的二硒化物表明,该活性高度依赖于甲氧基取代基的位置。尽管在4位和6位的甲氧基改变了硒的电子性质,但在6位的取代为催化循环中的某些关键中间体提供了所需的空间保护。详细的实验和理论研究表明,6-甲氧基取代基可防止硒烯基硫醚中间体中硒中心的不希望的硫醇交换反应。6-甲氧基取代基还防止硒酸和亚硒酸的形成。当PhSH用作硫醇共底物时,4-甲氧基取代的二硒化物表现出类似于母体化合物的GPx活性,因为4-甲氧基取代基不会阻断硫醇交换反应产生的硒烯基硫化物中间体中的硒中心。相反,当谷胱甘肽(GSH)