Reaction of 1, 6-anhydro-2, 2', 3, 4'-tetra-O-benzyl-β-lactose (1 mol eq.) with the acetylated oxazoline of N-acetyllactosamine (5 mol eq.) gave the corresponding 1, 6-anhydro-β-tetrasaccharide (3, 24.5%) and hexasaccharides (8, 53.5%). The protecting groups of 3 and 8 were removed by the following series of reactions to provide 6'-N-acetyl-lactosaminyllactose (7) and lacto-N-neohexaose (12), respectively : debenzylation followed by acetylation, acetolysis, and de-O-acetylation. 13C-NMR spectral data for 1, 6-anhydro-β-derivatives of 7 and 12 are presented.
1,6-脱
水-2,2',3,4'-四-O-苄基-
β-乳糖(1 摩尔当量)与 N-乙酰半
乳糖胺的乙酰化
噁唑啉(5 摩尔当量)反应,得到相应的 1,6-脱
水-β-四糖(3,24.5%)和六糖(8,53.5%)。通过以下一系列反应去除 3 和 8 的保护基团,分别得到 6'-N-乙酰基-乳
氨酰基半
乳糖(7)和乳-N-新六糖(12):先去苄基,再乙酰化、乙酰分解和去-O-乙酰化。图中给出了 7 和 12 的 1,6-脱
水-β-衍
生物的 13C-NMR 光谱数据。