Chemical synthesis of β-D-GlcpA(2SO4)-(1→3)-D-GalpNAc(6SO4), the disaccharide repeating unit of shark cartilage chondroitin sulfate D, and of its methyl β-D-glycoside derivative
作者:Nathalie Karst、Jean-Claude Jacquinet
DOI:10.1039/b002835p
日期:——
manner from D-glucose, whereas the glycosyl acceptors 20 and 21 are obtained from known 3,4,6-tri-O-acetyl-2-deoxy-2-trichloroacetamido-1-O-trichloroacetimidoyl-α-D-glucopyranose through glycosylation with benzyl alcohol and methanol, respectively, and subsequent transformation into D-galacto synthons by selective inversion of configuration at C-4. Unexpected pyranose → furanose ring contraction as well
钠的合成ø - (2-二钠ø -sulfonato-β- d -glucopyranosyluronate) - (1→3)-2-乙酰氨基-2-脱氧-6- ö -sulfonato- d -galactopyranose 1,其表示的结构首次报道了鲨鱼软骨素硫酸盐D的元素,其甲基β- D-糖苷衍生物2。葡糖醛酸供体10以直接的方式由D-葡萄糖制备,而糖基受体20和21获自已知的3,4,6-三-O-乙酰基-2-脱氧-2-三氯乙酰胺基-1- O-trichloroacetimidoyl-α- d通过糖基化,分别苯甲醇和甲醇,和随后转化成-glucopyranose d -半乳在C-4合成子由配置的选择性反相。意想不到吡喃糖→呋喃糖环的收缩以及3,6-脱水衍生物形成在d -半乳糖也报道系列。亚胺酸酯10与醇20和21的立体控制偶合分别得到相应的β-连接的二糖衍生物24和25,其经受N的自由基还原