Total Synthesis of the Echinodermatous Ganglioside LLG-3 Possessing the Biological Function of Promoting the Neurite Outgrowth
作者:Yu-Fa Wu、Yow-Fu Tsai、Yuahn-Sieh Huang、Jing-Feng Shih
DOI:10.1021/acs.orglett.0c02692
日期:2020.10.2
A total synthesis of echinodermatous ganglioside LLG-3 with neuritogenic activity was accomplished by a convergent strategy. The synthesis of 2-hydroxyethyl 8-O-Me-α-sialoside 2 was started from the phenyl 7,8-di-O-Pico-thiosialoside 5, which can be chemoselectively removed the picoloyl group, and then the methyl group in 8-O-MeNeu5Ac moiety was chemoselectively prepared using TMSCHN2/FeCl3. For preparation
棘皮性神经节苷脂 LLG-3 具有神经元活性的全合成是通过收敛策略完成的。2-羟乙基8- O -Me-α-sialoside 2的合成是从苯基7,8- di- O -Pico-thiosialoside 5 开始的,它可以化学选择性地去除吡啶甲酰基,然后是8中的甲基- ø -MeNeu5Ac部分使用化学选择性TMSCHN制备2 /的FeCl 3。为了制备末端二唾液酸单元,我们小组最初利用氧化酰胺化来有效构建 8- O的 α(2,11) 键-Me-Neu5Acα(2,11)Neu5Gc。在此,我们还证明合成的神经节苷脂 LLG-3 表现出对初级皮质神经元的神经元活性,并且生物活性优于神经节苷脂 DSG-A。