Abstract
Methyl (7,8-di- O-benzoyl-4,5- O-isopropylidene-3-deoxy- d- manno-2-oct-ulopyranoside)onate was found to be a useful new intermediate in the synthesis of an inner-core oligosaccharide of lipooligosaccharides and lipopolysaccharides produced by gram-negative bacteria. This intermediate could be converted to the corresponding glycosyl fluoride and 4,5-diol acceptor with ease. Syntheses of dimeric Kdo, O-(sodium 3-deoxy-α- d- manno-2-octuropyranosylonate)-(2–4)-sodium (allyl 3-deoxy-α- d- manno-2-octuropyranoside)onate, and O-(sodium 3-deoxy-α- d- manno-2-octuropyranosylonate)-(2–8)-sodium (allyl 3-deoxy-α- d- manno-2-octuropyranoside)onate were successfully demonstrated.
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