Synthesis of Benzene and Pyridine 2′-<i>C</i>-Methyl-<i>C</i>-ribonucleosides and -nucleotides
作者:Anna Tokarenko、Lenka Poštová Slavětínská、Blanka Klepetářová、Michal Hocek
DOI:10.1002/ejoc.201501219
日期:2015.12
A general and modular synthesis of substituted benzene and pyridine 2′-C-methyl-C-ribonucleosides was developed. Benzyl-protected haloaryl-C-nucleoside intermediates were prepared by the addition of bromo(het)aryllithium reagents to a protected lactone, followed by acetylation and reduction. These halogenated intermediates were further transformed by Pd-catalysed cross-couplings, aminations, or hydroxylations
开发了取代苯和吡啶 2'-C-甲基-C-核糖核苷的通用和模块化合成。苄基保护的卤代芳基-C-核苷中间体是通过将溴(杂)芳基锂试剂添加到受保护的内酯中,然后进行乙酰化和还原来制备的。这些卤化中间体通过 Pd 催化的交叉偶联、胺化或羟基化进一步转化。最后的脱保护相当麻烦,并且针对每种衍生物优化了不同的程序,包括在 Pd/C 上催化氢化或用 BCl3 处理。最终的 C-核苷也全部转化为相应的 NTP。在 HCV 复制子测定中,没有一种 C-核苷显示出任何活性,并且没有一种 NTP 显示出对 HCV 聚合酶的任何显着抑制。