The chemical synthesis of a series of mucin-type oligosaccharide fragments 1–7 containing an α-linked aminopropyl spacer ready for glycoarray attachment is reported. A highly convergent and stereoselective strategy that employs two different orthogonal protected galactosamine building blocks was used to access all of the targets. A tandem deprotection sequence, that did not require chromatography-based purification between steps, was employed to globally unmask all protecting groups and all final targets were isolated in good to excellent yields.
报道了一种包含α-连接的氨丙基间隔的黏蛋白型寡糖片段1-7的化学合成。采用高度收敛和立体选择性策略,使用两种不同的正交保护半乳糖氨基建块来获得所有目标物。采用串联去保护序列,无需在步骤之间进行基于色谱的纯化,全面揭示所有保护基,并且所有最终目标物都以良好至优异的产率分离。