Polyribosylribitol phosphate oligosaccharides are produced in a multistep process. The compound of the formula: ##STR1## wherein R.sub.1 is a first protecting group and R.sub.2 is a second protecting group, is coupled to a solid polyethylene glycol monomethyl ether (PEG) support. Following removal of the first protecting group, the resulting compound is coupled with a repeating unit for chain elongation of the formula: ##STR2## The protecting group is removed from the phosphorus atom and the steps of removing the first protecting group, coupling with the repeating unit is repeated until the desired number of repeating units in the oligomer has been terminated. The oligomer then is terminated with a chain terminating molecule of the formula: ##STR3## wherein m is an integer and R.sub.3 is a third protecting group. The resulting PEG-bound protected oligomer is a new product and the oligomer may be cleaved from the support and processed to provide a chemically-reactive functional group for binding the polysaccharide oligomer to a carrier molecule.
聚
核糖核醇
磷酸寡糖是通过多步骤过程制备的。该化合物的公式为:##STR1## 其中R.sub.1是第一个保护基团,R.sub.2是第二个保护基团,与固体
聚乙二醇单甲醚(P
EG)支持物耦合。去除第一个保护基团后,所得化合物与用于链延长的重复单元的公式耦合:##STR2## 从
磷原子中去除保护基团,并重复去除第一个保护基团、与重复单元耦合的步骤,直到所需寡聚体中的重复单元数目被终止。然后,使用公式的链终止分子终止寡聚体:##STR3## 其中m为整数,R.sub.3是第三个保护基团。所得到的P
EG结合保护寡聚体是一种新产品,可以从支持物中剪断寡聚体,并加工成一种
化学反应性功能基团,用于将
多糖寡聚体与载体分子结合。