NIS/TMSOTf-Promoted Glycosidation of Glycosyl <i>ortho</i>-Hexynylbenzoates for Versatile Synthesis of <i>O</i>-Glycosides and Nucleosides
作者:Rongkun Liu、Qingting Hua、Qixin Lou、Jiazhe Wang、Xiaona Li、Zhi Ma、You Yang
DOI:10.1021/acs.joc.1c00151
日期:2021.3.19
approach with glycosyl ortho-hexynylbenzoates as donors for the highly efficient synthesis of O-glycosides and nucleosides. The glycosidation approach highlights the merits of mild reaction conditions, cheap promoters, extremely wide substrate scope, and good to excellent yields. Notably, the glycosidation approach performs very well in the construction of a series of challenging O- and N-glycosidic
A general method for N-glycosylation of nucleobases promoted by (p-Tol)<sub>2</sub>SO/Tf<sub>2</sub>O with thioglycoside as donor
作者:Guang-jian Liu、Xiao-tai Zhang、Guo-wen Xing
DOI:10.1039/c5cc03617h
日期:——
35 nucleosides were synthesized by coupling thioglycosides with pyrimidines and purines under the preactivation of (p-Tol)2SO/Tf2O in high yields and with β-stereoselectivities.
plays pivotal role in controlling the outcome of the glycosylation. Recently discovered alkynyl glycosyl carbonate donors possess self-stability, high reactivity, and fast reaction time (15–30 min) when activated with [Au]/[Ag]-catalysts. Herein, we report metal free conditions for the activation of the same alkynyl glycosyl carbonate donors using I2/TMSOTf in stoichiometric quantities. Extrusion product
获得均质糖复合物对于评估其生物物理活性以及有时作为候选疫苗具有重要意义。糖复合物的合成涉及两种物质,其中糖基供体在控制糖基化结果中起着关键作用。最近发现的炔基糖基碳酸酯供体在用[Au]/[Ag]催化剂活化时具有自稳定性、高反应活性和快速反应时间(15-30分钟)。在此,我们报告了使用 I 2激活相同的炔基糖基碳酸酯供体的无金属条件/TMSOTf 按化学计量。通过单晶X射线分析,挤出产物被鉴定为偏二碘化乙烯。该反应条件适合合成各种糖苷、嘌呤/嘧啶核苷和肺炎克雷伯菌(O-3-抗原)的五糖重复单元。