Deconvoluting the Reactivity of Two Intermediates Formed from Modified Pyrimidines
作者:Liwei Weng、Sonia M. Horvat、Carl H. Schiesser、Marc M. Greenberg
DOI:10.1021/ol401472m
日期:2013.7.19
Generation of the 5-(2′-deoxyuridinyl)methyl radical (6) was reexamined. Trapping by 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl confirms that 6 is generated. However, trapping by methoxyamine reveals that the respective carbocation (10) is also produced. Examining the effects of these traps on products in DNA reveals that the carbocation and not 6 yields interstrand cross-links. Cross-link formation
重新检查了 5-(2'-脱氧尿苷基) 甲基 ( 6 ) 的生成。4-羟基-2,2,6,6-tetramethylpiperidin-1-oxyl 的捕获证实生成了6。然而,被甲氧基胺捕获表明也产生了相应的碳正离子 ( 10 )。检查这些陷阱对 DNA 产物的影响表明,碳正离子而不是6 会产生链间交联。碳阳离子的交联形成与 DFT 计算一致,该计算预测在 dA 的 N1 位置添加基本上是无障碍的。