Synthesis of 2,4-Disubstituted Pyrimidin-5-yl C-2′-Deoxyribonucleosides by Sequential Regioselective Reactions of 2,4-Dichloropyrimidine Nucleosides
作者:Tomáš Kubelka、Lenka Slavětínská、Blanka Klepetářová、Michal Hocek
DOI:10.1002/ejoc.201000164
日期:2010.5
A new modular synthesis of diverse 2,4-disubstituted pyrimidin-5-yl C-2′-deoxyribonucleosides by sequential regioselective reactions of 2,6-dichloropyrimidin-5-yl C-nucleosides was developed. The intermediate was prepared by the Heck coupling of 2,6-dichloro-5-iodopyrimidine with glycal followed by desilylation and reduction. Its mild nucleophilic substitutions or Fe-catalyzed cross-coupling with MeMgCl
通过 2,6-二氯嘧啶-5-基 C-核苷的顺序区域选择性反应,开发了多种 2,4-二取代嘧啶-5-基 C-2'-脱氧核糖核苷的新模块合成。中间体通过 2,6-二氯-5-碘嘧啶与乙二醇的 Heck 偶联制备,然后脱甲硅烷基化和还原。其温和的亲核取代或与 MeMgCl 的 Fe 催化交叉偶联在位置 4 处区域选择性地进行,而在升高的温度或过量的 MeMgCl 下,发生双取代。2-氯-4-取代的中间体经过另一次取代或偶联得到2,4-二取代的衍生物。