Activation of 3-Amino-1,2,4-benzotriazine 1,4-Dioxide Antitumor Agents to Oxidizing Species Following Their One-Electron Reduction
作者:Robert F. Anderson、Sujata S. Shinde、Michael P. Hay、Swarna A. Gamage、William A. Denny
DOI:10.1021/ja0209363
日期:2003.1.1
4-benzotriazine 1-oxides. By establishing redox equilibria between the intermediate radicals formed on the one-electron oxidation of the respective 3-amino-1,2,4-benzotriazine 1-oxides of the compounds and reference compounds, we found the one-electron reduction potential of the oxidizing radicals to range from 0.94 to 1.31 V. The benzotriazinyl radical of tirapazamine was found to oxidize dGMP and 2-deoxyribose
使用替拉扎明 (3-amino-1,2,4-benzotriazine 1,4-dioxide, 1) 研究了苯并三嗪 1,4-二氧化物类抗癌药物在单电子还原后产生氧化自由基的机制和其 6-甲氧基 (6)、7-二甲氨基 (7) 和 8-甲基 (8) 类似物。通过测量吸收随 pH 值的变化,我们发现自由基阴离子进行质子化,自由基 pK(r) 值为 6.19 +/- 0.05、6.10 +/- 0.03、6.45 +/- 0.04 和 6.60 +/- 0.04,分别。单电子还原物种经历了一级反应,速率常数从 112 +/- 23 s(-)(1) 增加到 777 +/- 12 s(-)(1)(6), 1120 +/- 29 s(-)(1) (7) 和 825 +/- 89 s(-)(1) (8) 在 pH 7 下。在单电子还原 6 后未观察到电导的总体变化, 和 8 在 pH 4.5, 与自由