Synthesis of Trisaccharides and Tetrasaccharides by Means of Intramolecular Glycosylation Supported by Rigid Spacers
作者:Matthias Müller、Richard R. Schmidt
DOI:10.1002/1099-0690(200106)2001:11<2055::aid-ejoc2055>3.0.co;2-n
日期:2001.6
4-O-unprotected galactoside derivative 6 as acceptor, afforded β-linked macrocyclic trisaccharide 9β in high yield after removal of the 3-O-MPM protective group and subsequent intramolecular glycoside bond formation. Similarly, by the same sequence of steps, the corresponding tetrasaccharide 14β was obtained from 5 and 4b-O-unprotected lactoside 11. For reiterative glycoside bond formation, treatment of α,α
用 6-O-未保护的硫代麦芽糖苷 4 作为糖基供体 (5),然后用 4-O-未保护的半乳糖苷衍生物 6 作为受体处理 α,α'-二溴-间二甲苯,以高产率得到 β-连接的大环三糖 9β在去除 3-O-MPM 保护基团和随后的分子内糖苷键形成后。类似地,通过相同的步骤顺序,从 5 和 4b-O-未保护的乳糖苷 11 中获得相应的四糖 14β。对于重复糖苷键的形成,用 3-O-未保护的 α,α'-二溴-间二甲苯处理硫糖苷 15 作为供体 (16),然后是 4,6-O-未保护的葡糖苷,随后糖基化得到大环麦芽三糖苷 22,将其转化为已知的麦芽三糖苷 23。