Synthesis of 8-(1,2,3-triazol-1-yl)-7-deazapurine nucleosides by azide–alkyne click reactions and direct C H bond functionalization
作者:Sam Kavoosi、Ramanjaneyulu Rayala、Brenna Walsh、Maria Barrios、Walter G. Gonzalez、Jaroslava Miksovska、Logesh Mathivathanan、Raphael G. Raptis、Stanislaw F. Wnuk
DOI:10.1016/j.tetlet.2016.08.053
日期:2016.9
8-bromotoyocamycin with sodium azide provided novel 8-azidotoyocamycin. Strain promoted click reactions of the latter with cyclooctynes resulted in the formation of the 1,2,3-triazole products. Iodine-mediated direct C8-H bond functionalization of tubercidin with benzotriazoles in the presence of tert-butyl hydroperoxide gave the corresponding 8-benzotriazolyltubercidin derivatives. The 8-(1,2,3-triazol-1-yl)-7-deazapurine
用甲醇中的1,3-二溴-5,5-二甲基乙内酰脲(rt / 30分钟)处理Toyocamycin或sangivamycin(产率为30分钟),得到的8-溴代霉素和8-broangangivamycin收率很高。用叠氮化钠对8-溴代霉素进行亲核芳香取代,从而提供了新型的8-阿奇多卡霉素。后者与环辛炔的应变促进的点击反应导致形成1,2,3-三唑产物。在叔丁基氢过氧化物的存在下,碘介导的结核菌素与苯并三唑的直接C8-H键官能化得到相应的8-苯并三唑基tubercidin衍生物。8-(1,2,3-三唑-1-基)-7-脱氮嘌呤衍生物显示出适度的量子产率和〜100 nm的大斯托克斯位移。