The preparation of novel head-to-head spacer-linked bisdaunosamine homodimers 8, 15 and 18 is described. The synthesis is achieved by double glycosylation of monosilylated 1,4-butanediol 9 using silyl glycoside 5 as glycosyl donor. Alternatively, olefin metathesis of allyl glycosides α-11 and particularly of α-12 constitutes a second route toward 8 and its unsaturated derivative 15 while non symmetrical
新颖头对磁头隔离联bisdaunosamine同二聚体的制备8,15和18进行说明。通过使用甲
硅烷基糖苷5作为糖基供体的单甲
硅烷基化的1,4-
丁二醇9的
双糖基化来实现合成。备选地,烯丙基糖苷α- 11,特别是α- 12的烯烃复分解构成了朝向8及其不饱和衍
生物15的第二条途径,而烯丙基糖苷11和12的交叉复分解获得了不对称的二聚体18。