Synthesis of a tetrasaccharide building block of the O-specific polysaccharide of Shigella dysenteriae type 1
作者:Vince Pozsgay、Cornelis P.J. Glaudemans、John B. Robbins、Rachel Schneerson
DOI:10.1016/s0040-4020(01)88331-9
日期:1992.11
derivative (1) of the tetrasaccharide α-d-Galp-(1→3)-α-d-GlcpNAc-(1→3)-α-L-Rhap-(1→3)-α-L-Rhap was synthesized in a highly stereoselective, stepwise manner, using methyl 1-thioglycosides of L-rhamnose, 2-azido-2-deoxy-D-glucose and D-galactose, as major intermediates. The protecting group scenario in compound 1 permits regioselective deblocking at its “non-reducing end” unit. Therefore 1 is a suitable
阿糖基三氯乙酰亚胺酯衍生物(1)的四糖α-d-Gal的的p - (1→3)-α-d-GLC p NAc-(1→3)-α-L-鼠李糖p - (1→3) - α-L-鼠李糖p是在一个高度立体选择性,逐步的方式合成,使用甲基-1-硫代糖苷L-鼠李糖,2-叠氮基-2-脱氧d葡萄糖和d半乳糖作为主要中间体。化合物1中的保护基团方案允许在其“非还原端”单元进行区域选择性解封闭。因此,1是用于制备标题多糖的延伸片段的合适中间体。