Nucleobase-Functionalized 7-Deazaisoguanine and 7-Deazapurin-2,6-diamine Nucleosides: Halogenation, Cross-Coupling, and Cycloaddition
作者:Zhenqiang Xia、Dasharath Kondhare、Somnath Shivaji Chandankar、Sachin A. Ingale、Peter Leonard、Frank Seela
DOI:10.1021/acs.joc.3c02514
日期:2024.2.2
quantum yields) of azide–alkyne click adducts bearing pyrene as sensor groups were determined. Pyrene fluorescence was solvent-dependent and changed according to the linker lengths. Excimer emission was observed in dioxane for the long linker adduct. Bioorthogonal inverse-electron-demanding Diels–Alder cycloadditions (iEDDA) were conducted on the electron-rich vinyl groups of 7-deazaisoguanine and 7-deazapurin-2
7-脱氮杂异鸟嘌呤和 7-脱氮杂嘌呤-2,6-二胺核糖核糖核糖核糖核苷和 2'-脱氧核糖核苷的 7 位通过卤素原子(氯、溴、碘)以及可点击的炔基和乙烯基侧链进行铜催化和描述了无铜环加成。在丙酮的作用下,解决了 7-碘化异鸟嘌呤核糖核苷和 2'-脱氧核糖核苷合成过程中出现的问题。研究了侧链和卤素原子对核苷 p K a值和疏水性的影响。卤代取代基按 Cl < Br < I 的顺序增加核苷的亲脂性,并降低质子化的 p K值。测定了带有芘作为传感器基团的叠氮-炔点击加合物的光物理性质(荧光、溶剂化显色和量子产率)。芘荧光依赖于溶剂并根据接头长度而变化。在二恶烷中观察到长连接子加合物的准分子发射。对作为亲二烯体的 7-deazaisoguanine 和 7-deazapurin-2,6-diamine 核苷的富电子乙烯基和 3,6-dipyridyl-1,2 进行生物正交逆电子需求 Diels-Alder