Chemical Synthesis of (3-SO3Na)GlcNAcβ1→3Fucβ1→OMe: The Oligosaccharide Involved in the Cell Aggregation of the SpongeMicrociona Prolifera
摘要:
The methyl glycoside, (3-SO3Na)GlcNAc beta 1-->3Fuc beta 1-->OMe, of a sulfated disaccharide that is involved in the species-specific reaggregation of dissociated cells of Microciona prolifera, was stereoselectively synthesized starting from L-fucose and 2-amino-2-deoxy-D-glucose.
Two different protocols for the mild and selective acetolysis of 6-deoxysugar methyl disaccharides under thermodynamic or kinetic control have been developed. The structures of the disaccharides obtained depend on the protocol used and, in the kinetically controlled cases, on the 6-deoxysugar configuration and protecting group pattern too. The behavior of 6-deoxyhexose oligosaccharides of different
Chemical Synthesis of (4,6-Pyr)-Gal β1→4GlcNAcβ1→3Fucβ1→OMe: A Pyruvated Trisaccharide Related to the Cell Aggregation of the Sponge<i>Microciona Prolifera</i>
4,6-O-[(R)-1-carboxylethylidene] Gal beta 1-->4GlcNAc beta 1-->3Fuc beta 1-->OMe, a pyruvated trisaccharide unit involved in the aggregation factor of the marine sponge Microciona prolifera, was synthesized stereospecifically and unambiguously employing thioglycosides as glycosyl donors to construct glycosidic bonds.