Expeditious and stereocontrolled syntheses of β-D-GlcpA(2SO4)-(1⇄3)-[β-D-GalpNAc(6-SO4)-(1⇄4)-β-D-GlcpA(2-SO4)(1⇄3)]n-β-D-GalpNAc(6-SO4)-(1⇄OMe) (where n = 1 and 2), which represent structural elements of shark cartilage chondroitin sulfate D, are reported for the first time. The compounds were obtained from a common key disaccharide donor 15, which was used in an iterative way, and in which the 2
β-D-GlcpA(2SO4)-(1⇄3)-[β-D-GalpNAc(6-SO4)-(1⇄4)-β-D-GlcpA(2-SO4)(1)的快速立体控制合成⇄3)]n-β-D-GalpNAc(6-SO4)-(1⇄OMe)(其中 n = 1 和 2),它们代表了鲨鱼软骨
硫酸软骨素 D 的结构元素,这是首次报道。这些化合物是从一个共同的关键二糖供体15中得到的,它以迭代的方式使用,其中2-脱氧-2-三
氯乙酰胺基团被用作有效的立体控制助剂。
D-葡萄糖醛酸供体 7 很容易从
D-葡萄糖制备,而
D-半乳糖胺受体 11 是从
D-葡萄糖胺前体开始合成的。(© Wiley-
VCH Verlag GmbH, 69451 Weinheim, 2002)