A General Regioselective Approach to 2,4-Disubstituted Pyrimidin-5-yl C-2-Deoxyribonucleosides
作者:Michal Hocek、Tomáš Kubelka、Lenka Slavětínská
DOI:10.1055/s-0031-1289694
日期:2012.3
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-nucleoside 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 cross-coupling reactions proceeded regioselectively
的多样2,4-二取代的嘧啶-5-基甲新的模块化合成Ç通过2,6-二氯嘧啶-5-基的区域选择性顺序反应-2'-脱氧核糖核苷Ç核苷被开发。通过将2,6-二氯-5-碘嘧啶与糖类进行Heck偶联,然后进行甲硅烷基化和还原来制备中间体。其轻度的亲核取代或交叉偶联反应在第4位区域选择性进行,而在高温或过量试剂的作用下,发生了双重取代。对2-氯-4-取代的中间体进行另一次取代或偶联,以得到各种2,4-二取代的嘧啶-5-基C -2-脱氧核糖核苷酸的二维文库。 核苷-交叉偶联-Heck反应-亲核芳族取代-区域选择性