Complex Structures of Antennary Human Milk Oligosaccharides − Synthesis of a Branched Octasaccharide
作者:Petra Knuhr、Julio Castro-Palomino、Matthias Grathwohl、Richard R. Schmidt
DOI:10.1002/1099-0690(200111)2001:22<4239::aid-ejoc4239>3.0.co;2-m
日期:2001.11
blocks − 4, 7, 8, and 12 − the required three disaccharide units were obtained, resulting after further protecting group manipulation and glycoside bond formation in the desired tetrasaccharides 13 and 16. Cleavage of the TBDMS group of 13 afforded tetrasaccharide 14, which was transformed into isolactosamine-β-(13)-lactosamine trichloroacetimidate 15. Removal of the 4b,6b-O-benzylidene group of tetrasaccharide
我们开发了一条高度收敛的合成路线,用于合成人乳八糖支链结构 β-D-吡喃半乳糖-(13)-2-乙酰氨基-2-脱氧-β-D-吡喃葡萄糖基-(13)-β- D-吡喃半乳糖基)-(14)-2-乙酰氨基-2-脱氧-β-D-吡喃葡萄糖基-(16)-[β-D-吡喃半乳糖基-(13)-2-乙酰氨基-2-脱氧-β-D-吡喃葡萄糖基-(13)]-β-D-吡喃半乳糖基-(14)-α,β-D-吡喃葡萄糖(1)。在逆合成分析中,目标结构 1 被断开为构建块 2-6。仅从四个已知的构建块 - 4、7、8 和 12 开始 - 获得所需的三个二糖单元,在所需的四糖 13 和 16 中进一步保护基团操作和糖苷键形成后得到。TBDMS 基团 13 的裂解得到四糖14,