Synthesis of the Blocked Pentasaccharide Derivative Related to the Repeating Unit of the O‐Antigen from<i>Shigella dysenteriae</i>Type 3 in the Form of Its Allyl Glycoside
作者:Sujit Kumar Sarkar、Nirmolendu Roy
DOI:10.1081/car-120023471
日期:2003.1.8
tetrasaccharide derivative allyl 2,3,6‐tri‐O‐benzyl‐4‐O‐[methyl (R)‐2‐propanoate]‐β‐d‐glucopyranosyl‐(1→6)‐2,3,4‐tri‐O‐benzyl‐α‐d‐glucopyranosyl‐(1→4)‐2,6‐di‐O‐benzyl‐3‐O‐(3,4,6‐tri‐O‐acetyl‐2‐deoxy‐2‐phthalimido‐β‐d‐galactopyranosyl)‐α‐d‐galactopyranoside has been synthesized via block synthesis strategy, with one of the blocks containing a methyl (R)‐2‐propanoate group. Manipulation of protecting
从d-半乳糖胺盐酸盐,d-半乳糖和d-葡萄糖开始,四糖衍生物烯丙基2,3,6-三-O-苄基-4-O- [甲基(R)-2-丙酸酯]-β-d-吡喃葡萄糖基-(1→6)-2,3,4-三-O-苄基-α-d-吡喃葡萄糖基-(1→4)-2,6-二-O-苄基-3-O-(3,4已通过嵌段合成策略合成了6-6-三-O-乙酰基-2-脱氧-2-邻苯二甲酰亚胺基-β-d-吡喃半乳糖苷)-α-d-吡喃半乳糖苷,其中一个嵌段含有甲基(R)-2丙酸酯基。操纵该四糖衍生物的保护基,然后与半乳糖呋喃糖苷供体反应,得到所需的五糖衍生物,其形式为烯丙基糖苷,与痢疾志贺氏菌3型的再生成单元有关。