5-Selenocyanato and 5-trifluoromethanesulfonyl derivatives of 2′-deoxyuridine: synthesis, radiation and computational chemistry as well as cytotoxicity
作者:Samanta Makurat、Magdalena Zdrowowicz、Lidia Chomicz-Mańka、Witold Kozak、Illia E. Serdiuk、Paweł Wityk、Alicja Kawecka、Marta Sosnowska、Janusz Rak
DOI:10.1039/c8ra03172j
日期:——
about the domination of the OTfdU(N3–H)− anion in the equilibrium mixture. As a consequence, electron addition chiefly leads to the radical dianion, OTfdU(N3–H)˙2−, which easily protonates at the C5 site. As a result, the C5–O rather than O–S bond undergoes dissociation, leading to dU, observed experimentally. A negligible cytotoxicity of the studied compounds toward the MCF-7 cell line at the concentrations
合成了 5-Selenocyanato-2'-deoxyuridine (SeCNdU) 和 5-trifluoromethanesulfonyl-2'-deoxyuridine (OTfdU),并通过 NMR 和 MS 方法确认了它们的结构。当在含有羟基自由基清除剂的水溶液中用 X 射线照射时,这两种化合物都会发生解离电子附着 (DEA)。SeCNdU 的 DEA 产量显着超过 5-bromo-2'-deoxyuridine (BrdU),与计算显示的电子诱导降解曲线保持良好的一致性。辐解产物表明,与理论预测一致,Se-CN 键解离是主要的反应通道。另一方面,OTfdU 的 DEA 产量略低于 BrdU 的降解产量,尽管计算出的电子诱导 OTfdU 解离的驱动力大大超过了 BrdU 降解的热力学刺激。此外,计算的 DEA 曲线表明电子附着诱导 OTfdU 形成 5-羟基-2'-脱氧尿苷 (OHdU),而