Indolequinone Antitumor Agents: Reductive Activation and Elimination from (5-Methoxy-1-methyl-4,7-dioxoindol-3-yl)methyl Derivatives and Hypoxia-Selective Cytotoxicity in Vitro
作者:Matthew A. Naylor、Elizabeth Swann、Steven A. Everett、Mohammed Jaffar、John Nolan、Naomi Robertson、Stacey D. Lockyer、Kantilal B. Patel、Madeleine F. Dennis、Michael R. L. Stratford、Peter Wardman、Gerald E. Adams、Christopher J. Moody、Ian J. Stratford
DOI:10.1021/jm970744w
日期:1998.7.1
of the 3-hydroxymethyl derivative, radiolytic generation of semiquinone radicals and HPLC analysis indicated that efficient elimination of the leaving group occurred following one-electron reduction of the parent compound. The active species in leaving group elimination was predominantly the hydroquinone rather than the semiquinone radical. The resulting iminium derivative acted as an alkylating agent
通过相应的3-(羟甲基)吲哚醌的功能化合成了一系列在(indol-3-yl)甲基位置具有多种离去基团的吲哚醌,并将所得化合物作为生物还原活化的细胞毒素进行体外评估。在化学和定量辐解条件下还原活化后,证明了一系列官能团(羧酸盐、苯酚和硫醇)的消除。只有在两组条件下消除这些基团的化合物才表现出显着的缺氧选择性,缺氧:好氧毒性比在 10-200 范围内。除 3-羟甲基衍生物外,半醌自由基的辐射分解产生和高效液相色谱分析表明,离去基团的有效消除发生在母体化合物的单电子还原之后。离去基团消除的活性物质主要是氢醌而不是半醌自由基。得到的亚胺衍生物作为烷基化剂,在化学还原后被添加的硫醇有效地捕获,在辐射还原后被水或 2-丙醇有效地捕获。观察到在氢供体(2-丙醇)存在下自由基引发的这些吲哚醌(在更简单的苯醌中未见)还原的链式反应。在 V79-379A 细胞中,发现 C-2 处未取代的化合物作为细胞毒素的效力是其