Synthesis of 2,6-disubstituted pyridin-3-yl C-2′-deoxyribonucleosides through chemoselective transformations of bromo-chloropyridine C-nucleosides
作者:Tomáš Kubelka、Lenka Slavětínská、Václav Eigner、Michal Hocek
DOI:10.1039/c3ob40774h
日期:——
2-Bromo-6-chloro- and 6-bromo-2-chloropyridin-3-yl deoxyribonucleosides were prepared by the Heck coupling of bromo-chloro-iodopyridines with TBS-protected deoxyribose glycal. Some of their Pd-catalyzed cross-coupling reactions proceeded chemoselectively at the position of the bromine, whereas nucleophilic substitutions were unselective and gave mixtures of products. The mono-substituted intermediates were used for another coupling or nucleophilic substitution giving rise to a small library of title 2,6-disubstituted pyridine C-deoxyribonucleosides. The title nucleosides did not exert antiviral or cytostatic effects.
通过溴-氯-碘吡啶与 TBS 保护的脱氧核糖糖醛的赫克偶联,制备了 2-溴-6-氯和 6-溴-2-氯吡啶-3-基脱氧核苷。其中一些钯催化的交叉耦合反应在溴的位置上进行化学选择性反应,而亲核取代反应则是非选择性的,得到的产物是混合物。单取代中间体被用于另一种偶联或亲核取代,从而产生了一个小型的 2,6-二取代吡啶 C-脱氧核苷库。标题核苷不具有抗病毒或细胞抑制作用。