Photooxidative Damage of Guanine in DG and DNA by the Radicals Derived from the α Cleavage of the Electronically Excited Carbonyl Products Generated in the Thermolysis of Alkoxymethyl-Substituted Dioxetanes and the Photolysis of Alkoxyacetones
作者:Waldemar Adam、Markus A. Arnold、Chantu R. Saha-Möller
DOI:10.1021/jo0056491
日期:2001.1.1
oxidative reactivity order in the dioxetane thermolysis, as well as in the ketone photolysis, parallels the ability of the excited ketones to release radicals (determined by spin trapping with DMPO and EPR spectroscopy) upon alpha cleavage (Norrish-type-I reaction). In the presence of molecular oxygen, the carbon-centered radicals are scavenged to produce peroxyl radicals, which are proposed as the reactive
在存在下对3,3,4,4-四甲基-1,2-二氧杂环丁烷(TMD)的甲氧基(MeO-TMD),叔丁氧基(tBuO-TMD)和羟基(HO-TMD)衍生物进行热解与dG和小牛胸腺DNA相比,鸟嘌呤比母TMD的氧化效率更高。对于相应的氧取代的酮相对于丙酮的光解,观察到相同的氧化反应性趋势。二氧杂环丁烷热解以及酮光解中的氧化反应顺序与被激发的酮在α裂解(Norrish-I型反应)时释放自由基的能力(由DMPO和EPR光谱自旋俘获测定)相平行。在分子氧存在下,以碳为中心的自由基被清除以产生过氧自由基,