Development of Routes for the Stereoselective Preparation of β-Aryl-<i>C</i>-glycosides via <i>C</i>-1 Aryl Enones
作者:Adesh Kumar Singh、Vimlesh Kumar Kanaujiya、Varsha Tiwari、Shahulhameed Sabiah、Jeyakumar Kandasamy
DOI:10.1021/acs.orglett.0c02843
日期:2020.10.2
various arylboronic acids bearing electron-donating and -withdrawing groups in the presence of palladium acetate and 1,10-phenanthroline. These reactions provided synthetically useful C-1 aryl enones in good yields. Many sensitive functional groups as well as protecting groups present in arylboronic acids and enones, respectively, remained intact under optimized conditions. The stereoselective hydrogenation
宽范围的烯酮衍生自d -glucal,d -galactal,升-rhamnal,d -rhamnal,和升-arabinal后行与各种芳基硼酸轴承供电子和在乙酸钯的存在吸电子基团的Heck耦合和1,10-菲咯啉。这些反应以良好的产率提供了合成上有用的C -1芳基烯酮。在优化的条件下,芳基硼酸和烯酮中分别存在的许多敏感官能团和保护基团保持完整。C -1芳基烯酮与Pd-C / H 2的立体选择性加氢提供2-脱氧芳基-C的β-异构体-糖苷具有优异的产率。所述C- 1芳基烯酮也被用来作为用于2-羟基β -芳基-的合成前体Ç -glycosides。以优异的产率实现了C -1芳基烯酮的区域选择性C -2卤化和乙烯基化。