Abstract
The title trisaccharide was synthesized from 6- O-acetyl-2,3,4-tri- O-benzyl-α- d-glucopyranosyl chloride ( 10), ethyl 2,4-di- O-benzyl-1-thio- ( 5) and benzyl 3,4-di- O-benzyl-α- l-rhamnopyranoside ( 9). The disaccharide 11 obtained from compounds 5 and 10 was used as the glycosyl donor to glycosylate the rhamnopyranoside derivative 9 having free OH-2 using the NIS–AgOTf-mediated glycosylation methodology. Zemplén deacetylation of the trisaccharide 12 resulted in the 6′′-OH derivative ( 13), which was selectively oxidized with CrO 3 to the uronic acid derivative 14. The benzyl groups were removed by catalytic hydrogenolysis to furnish the target trisaccharide ( 1).
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