A detailed study is reported on the influence of the functional groups present in the glycosyl donor towards the stereoselective glycosylation of 2‐azido‐2‐deoxy sugar thioglycosides under the N ‐iodosuccinimide (NIS) and TfOH mediated glycosylation conditions.
A convergent synthetic strategy has been developed for the synthesis of a hexasaccharide corresponding to the O-antigen of E. coli O41 using stereoselective [3 + 3] block glycosylation strategy. The target compound was synthesized assembling a series of suitably protected monosaccharide intermediates. Thioglycoside derivatives have been used as glycosyl donors in most of the glycosylation reactions. All intermediate steps are high yielding and the glycosylation steps are highly stereoselective. A number of recently developed methodologies have been used in the synthesis.
利用立体选择性[3 + 3]嵌段糖基化策略,开发了一种聚合合成策略,用于合成与大肠杆菌 O41 的 O 抗原相对应的六糖。目标化合物是由一系列适当保护的单糖中间体组装合成的。在大多数糖基化反应中,硫代糖苷衍生物都被用作糖基供体。所有中间步骤的产量都很高,糖基化步骤的立体选择性也很高。最近开发的一些方法已用于合成。
Tanikawa, Tetsuya; Fridman, Micha; Zhu, Wenjiang, Journal of the American Chemical Society, 2009, vol. 131, p. 5075 - 5083
作者:Tanikawa, Tetsuya、Fridman, Micha、Zhu, Wenjiang、Faulk, Brian、Joseph, Isaac C.、et al.