alpha-L-Rhap-(1----3)-beta-D-GlcpA and beta-D-GlcpA-(1----3)-alpha-L-Rhap bearing amide-linked L-serine or L-threonine, which represent the repeating unit(s) of the capsular polysaccharide from E. coli O6:K54:H10, have been synthesised. O-tert-Butyl-protected amino acid tert-butyl esters were condensed with the corresponding biouronic acid as the 2-acrylamidoethyl or 2-azidoethyl glycosides. The azido function was
带有酰胺连接的
L-丝氨酸的二糖α-L-Rhap-(1 ---- 3)-β-D-GlcpA和β-D-GlcpA-(1 ---- 3)-α-L-Rhap已经合成了代表来自大肠杆菌O6:K54:H10的荚膜
多糖的重复单元的L-或苏
氨酸。将O-叔丁基保护的
氨基酸叔丁酯与相应的
生物糖醛酸缩合为2-
丙烯酰胺基乙基或2-
叠氮基乙基糖苷。通过催化氢化然后进行N-
丙烯酰化,
叠氮基官能团被
丙烯酰胺基取代。通过用
三氟乙酸处理除去叔丁基,得到目标单体,将其与
丙烯酰胺共聚,得到新的糖缀合物,其可用于免疫
化学研究。