Abstract
The synthesis of the ribosyl-ribitol derivatives 15 and 17 (Scheme 2) is presented. The compounds served as building blocks for the preparation of protected fragments ( 24 , n=1 or 2; Fig. 2) of the title polysaccharide. The bifunctional reagent bis[1-benzotriazolyl]-2-chlorophenylphosphate ( 18 , Fig. 2) was used for all phosphorylation reactions. Attachment to a spacer and complete deprotection of the products, to afford 25 (n=2 or 3), is described.
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