Hydrazinolysis-N-reacetylation of glycopeptides and glycoproteins. Model studies using 2-acetamido-1-N-(l-aspart-4-oyl)-2-deoxy-β-d-glucopyranosylamine
作者:Brad Bendiak、Dale A. Cumming
DOI:10.1016/0008-6215(85)85001-1
日期:1985.11
2-Acetamido-1-N-(L-aspart-4-oyl)-2-deoxy-beta-D-glucopyranosyla mine (1) was used as a model glycopeptide to study the hydrazinolysis-N-reacetylation procedure. The major, initial product was the beta-acetohydrazide derivative of 2-acetamido-2-deoxy-D-glucose (2) which gave 2-acetamido-2-deoxy-D-glucose (5) after exposure to acidic conditions. Very mild conditions of hydrolysis of 2 gave a 75-80% overall
以2-乙酰氨基-1-N-(L-天冬氨酸4-酰基)-2-脱氧-β-D-吡喃葡萄糖苷(1)为模型糖肽,研究肼解-N-再乙酰化过程。主要的初始产物是2-乙酰氨基-2-脱氧-D-葡萄糖的β-乙酰肼衍生物(2),在酸性条件下产生2-乙酰氨基-2-脱氧-D-葡萄糖(5)。肼解-N-再乙酰化步骤后,非常温和的2水解条件从1得到75-80%的总产率为5。检测到其他几种次要化合物,它们在温和的酸水解下不能转化为5,表明在寡糖的还原端不能以5的形式回收20-25%的产物。