A simple synthetic methodology, based on the inverse electron demand hetero DielsâAlder reaction of electron-poor dienic o-thioquinones with electron-rich styrenes used as dienophiles, allowed the preparation of several polyhydroxylated 4-thiaflavans. Such compounds, as a function of the nature and position of the substituents on the aromatic rings, as well as of the oxidation state of the sulfur atom, are able to behave in vitro as efficient antioxidants mimicking the action of catechol containing flavonoids or/and tocopherols. The possibility of joining together the potentialities of two relevant families of natural polyphenolic antioxidants appears particularly appealing since an efficient protection against free radicals and other reactive oxygen species (ROS) depends in vivo upon the synergic action of different antioxidant derivatives.
通过一种简单的合成方法,以电子贫乏的二元邻
硫醌与电子丰富的
苯乙烯(用作二烯烃)发生的反电子需求杂化 DielsâAlder 反应为基础,制备出了几种多羟基 4-
噻吩黄烷。根据芳香环上取代基的性质和位置以及
硫原子的氧化状态,这些化合物能够在体外作为高效
抗氧化剂,模拟含
儿茶酚的类
黄酮或/和
生育酚的作用。将两个相关天然多
酚抗氧化剂家族的潜力结合在一起的可能性似乎特别有吸引力,因为在体内有效抵御自由基和其他活性氧(ROS)取决于不同
抗氧化剂衍
生物的协同作用。