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Branched Pentasaccharides

The O-polysaccharides of Shigella dysenteriae are structurally very distinct from those of the S. flexneri [20] and have been the subject of synthetic studies in which a branched pentasaccharide of the serotype 2 antigen was prepared [96],... [Pg.8]

The enzyme will also transfer glucose to other carbohydrate acceptors such as Schardinger dextrin, or mal-totetraose to form an a-(l- 6)-linked glucosyl Schardinger dextrin or a branched pentasaccharide, or even to free glucose to form isomaltose (15,33). In this respect the glucosidase (dextrin 6-... [Pg.134]

More recently, the trichloroacetimidate strategy has been applied to the synthesis of a branched pentasaccharide unit common to most complex Af-glycan structures (Scheme 10). Reaction of marmosyl donor 57 with thiol-functionalized resin resulted in attachment to the polymer matrix through the reducing end of the sugar... [Pg.16]

A. Geyer, R.R. Schmidt, Solid-phase supported synthesis of the branched pentasaccharide moiety that occurs in most complex type N-glycan chains, Angew. Chem., Int. Ed. 1998, 37, 1241-1245. [Pg.688]

Finally, the branched pentasaccharide donor 51 was used to glycosylate disaccharide acceptor 52 in the presence of NIS/TfOH, and produced the corresponding heptasaccharide 53 in 50% yield. The TfOH concentration, and the amount and type of molecular sieves used in this final coupling turned out to be crucial. [Pg.54]

Fig. 8.5 Tuguajalapin VII, the largest known resin glycoside monomer (MM 1771 and operculin V as examples for branched pentasaccharides conjugated to jalapinolic acid with saturated straight-long-chain fatty acid residues linked to different positions of different monosaccharide units. Both resin glycosides share a common glycosidic acid, operculinic acid A... Fig. 8.5 Tuguajalapin VII, the largest known resin glycoside monomer (MM 1771 and operculin V as examples for branched pentasaccharides conjugated to jalapinolic acid with saturated straight-long-chain fatty acid residues linked to different positions of different monosaccharide units. Both resin glycosides share a common glycosidic acid, operculinic acid A...
Branched Pentasaccharides.-Syntheses have been described of the following members of this category -Neu5Ac-(2- 3)-i8-D-Ga p-[a-L-Fu(y-(l- 3)]- -D-Glq7NAc-(W3)-D-... [Pg.68]

Branched Pentasaccharides.- O- -D-Galp-(l- 4)-0-/9-D-GlcpNAc-(l->6)-0-[ -D-Galp-( 1-3) ]-Q-i8-D-GalE-( 1- 4)-D-Glc has been isolated from horse colostrum, and a-D-Neup-NAc-(2-3)-Q-j8-D-Galp-(l-3)-Q-... [Pg.57]

A branched pentasaccharide containing a macrocyclic lactone ring related to that in compounds (15) and (16) is mentioned in Chapter 7. [Pg.57]

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Pentasaccharide

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