Synthesis of Two Tetra- and Four Pentasaccharide Fragments of<i>Shigella flexneri</i>Serotypes 3a and X O-Antigens from a Common Tetrasaccharide Intermediate
作者:Julien Boutet、Laurence A. Mulard
DOI:10.1002/ejoc.200800693
日期:2008.11
Ac→2]-α-L-Rhap-(1→3)-β-D-GlcpNAc-(1→}n ((E)ABAcCD)n polymer were synthesized as their propyl glycosides by use of a common fully protected (E)ABAcC intermediate (9). Tetrasaccharide 9 derived from the condensation of an EA donor and a BAcC acceptor. Partial and full deprotection gave free tetrasaccharides (E)ABAcC and (E)ABC, respectively. Alternatively, 9 was converted into a trichloroacetimidate
所得受体与 D 供体的糖基化,以及随后的部分或全部脱保护,得到支链五糖 D(E)ABAcC 和 D(E)ABC。所有目标都是志贺氏菌 3a 的 O 抗原的一部分,这是一种流行的血清型。非 O-乙酰化寡糖由 S.flexneri 血清型 X O-抗原共有。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)