Iterative One-Pot α-Glycosylation Strategy: Application to Oligosaccharide Synthesis
作者:Chih-Yueh Ivan Liu、Shaheen Mulani、Kwok-Kong Tony Mong
DOI:10.1002/adsc.201200396
日期:2012.11.26
three iterative one-pot α-glycosylation methods, i.e., one-pot (α,α)-, one-pot (β,α)-, and one-pot (α,β)-glycosylations, were developed. These methods are applicable to a range of thioglycosyl donors, confer stereocontrol in α-/β-glycosidic bond formation, and thus provide for rapid access to oligosaccharides with various permutations of anomeric configurations. The utility of these one-pot glycosylation
基于二甲基甲酰胺(DMF)调节和邻近基团参与的组合使用,三种迭代的一锅法α-糖基化方法,即一锅法(α,α)-,一锅法(β,α)-和一种锅(α,β)糖基化。这些方法适用于一系列硫糖基供体,赋予α-/β-糖苷键形成立体控制,因此可快速进入具有异头构型各种排列的寡糖。这些一锅式糖基化方法的实用性在八个非天然和天然寡糖靶标的合成中得到了证明,其中包括核心1丝氨酸缀合物,核心8丝氨酸缀合物,D-Gal-α(13)-D-Glc-肺炎链球菌细胞壁成分的α(13)-L-Rha三糖单元N连接的聚糖前体的D-Glc-α(12)-D-Glc-α(13)-D-Glc三糖末端。这些低聚糖的端基异构构型的确认通过1 H,13 C,13 C-非质子去耦和异核相关2D NMR实验证明。说明了所选寡糖靶标的整体脱保护。