Total Synthesis of the Repeating Unit of <i>Bacteroides fragilis</i> Zwitterionic Polysaccharide A1
作者:Ennus K. Pathan、Bhaswati Ghosh、Ananda Rao Podilapu、Suvarn S. Kulkarni
DOI:10.1021/acs.joc.0c02935
日期:2021.5.7
carriers. Reported herein is a total synthesis of the repeating unit of Bacteroides fragilis zwitterionic polysaccharide A1 (PS A1). The structurally complex tetrasaccharide unit contains a rare sugar 2-acetamido-4-amino-2,4,6-trideoxy-d-galactose (AAT) and two consecutive 1,2-cis glycosidic linkages. The repeating unit was efficiently assembled by rapid synthesis of d-galactosamine and AAT building
从共生细菌中分离出的两性离子多糖具有独特的免疫学特性,并且正在作为免疫治疗剂和疫苗载体出现。本文报道的是脆弱拟杆菌两性离子多糖A1(PS A1)的重复单元的全合成。的结构复杂的四糖单元含有稀有糖2-乙酰氨基-4-氨基-2,4,6-三脱氧d半乳糖(AAT)和两个连续的1,2-顺式糖苷键。通过廉价的丰富的d-甘露糖通过一锅S N快速合成d-半乳糖胺和AAT结构单元,有效地组装了重复单元2,4-双三氟甲磺酸酯的置换和以高度立体选择性的方式安装所有糖苷键。总合成涉及最长的线性步骤,共17个步骤,总产率为3.47%。