xyuridine (AvdU) and cytidine (AvdC). The addition of radiation-produced electrons to C5-azido nucleosides leads to the formation of π-aminyl radicals followed by facile conversion to σ-iminyl radicals either via a bimolecular reaction involving intermediate α-azidoalkyl radicals in AmdU/AmdC or by tautomerization in AvdU/AvdC. AmdU demonstrates effective radiosensitization in EMT6 tumor cells.
合成了两类
叠氮基修饰的
嘧啶核苷作为潜在的放射增敏剂;一类是5-
叠氮甲基-
2'-脱氧尿苷(AmdU)和
胞苷(AmdC),第二类是5-(1-
叠氮乙烯基)-
2'-脱氧尿苷(AvdU)和
胞苷(AvdC)。将辐射产生的电子添加到 C5-
叠氮基核苷上会导致 π-
氨基自由基的形成,然后通过涉及 AmdU/AmdC 中中间体 α-
叠氮基烷基自由基的双分子反应或通过 AvdU 中的互变异构化轻松转化为 σ-亚
氨基自由基/AvdC。AmdU 在
EMT6 肿瘤细胞中表现出有效的放射增敏作用。