作者:Frieder W. Lichtenthaler、Markus Oberthür、Siegfried Peters
DOI:10.1002/1099-0690(200110)2001:20<3849::aid-ejoc3849>3.0.co;2-q
日期:2001.10
Straightforward, preparatively efficient procedures are described for the construction of β(14)-intergalactosidic linkages up to the hexasaccharide level. Key elements were the use of phenylthio and/or phenyl sulfoxide functionalities for glycosylations and a judiciously designed blocking group pattern for donor and acceptor alike: pivaloyl protection at O-2 for securing β-selectivity, sterically undemanding
描述了构建 β(14)-半乳糖苷键直至六糖水平的直接、制备有效的程序。关键要素是使用苯硫基和/或苯亚砜官能团进行糖基化,以及为供体和受体等精心设计的封闭基团模式:O-2 处的新戊酰基保护以确保 β-选择性,O-3 处空间上不需要的烯丙基或苄基和 O-6 以最小化非反应性半乳糖基-4-OH 周围的空间体积,对甲氧基苯基部分,容易被 SPh 取代,作为中间异头取代基,以及用于临时保护末端 Gal-4-OH 的乙酰基. 该策略适用于供体和受体的迭代块合成和交换,从而展示了整体方法的广泛范围和通用性。