Synthesis of C3′ Modified Nucleosides for Selective Generation of the C3′-Deoxy-3′-thymidinyl Radical: A Proposed Intermediate in LEE Induced DNA Damage
作者:Suaad A. S. Audat、CherylAnn Trzasko Love、Buthina A. S. Al-Oudat、Amanda C. Bryant-Friedrich
DOI:10.1021/jo300045m
日期:2012.4.20
3′-dideoxy-C3′-thymidinyl radical (C3′dephos sugar radical), phenyl selenide and acyl modified sugar and nucleoside derivatives have been synthesized, and their suitability as photochemical precursors of the radical of interest has been evaluated. Upon photochemical activation of C3′-derivatized nucleosides in the presence of the hydrogen atom donor tributyltin hydride, 2′,3′-dideoxythymidine is formed
据信由低能电子(LEE)诱导的DNA损伤途径涉及2-脱氧核糖自由基的形成。这些自由基形成在核苷酸的C3'和C5'位置,是通过将LEEs从核碱基转移至DNA寡聚体的磷酸基团而裂解C–O磷酸二酯键的结果。已经获得了大量信息,以阐明通过该过程形成的未修饰寡核苷酸产物的身份。然而,关于由这些糖基的降解形成的修饰病变的性质的信息很少。确定通过2',3'-二脱氧-C3'-胸苷基(C3'dephos糖自由基),苯基硒化物和酰基修饰的糖以及核苷衍生物已经合成,并且已经评估了它们作为目标自由基的光化学前体的适用性。在存在氢原子供体三丁基锡氢化物的情况下,对C3'衍生的核苷进行光化学活化后,形成2',3'-二脱氧胸苷,表明选择性生成了C3'磷酸基团。这些前体将使鉴定和量化由LEEs产生的自由基引起的DNA损伤的产物成为可能。