Synthesis of the Methyl, 1-Octyl, andD-Trifluoro-Acetamidophentlethyl α-Glycosides of 3,6-Di-O-(α-D-Galactopyranosyl)-D-Glucopyranose and an Acyclic Analogue Thereof

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Abstract
The title trisaccharides were synthesized from a common trisaccharide thioglycoside derivative, which was, in turn, prepared from monosaccharide thioglycoside precursors. An acyclic analogue, methyl 3-O-(α-D-galacto-pyranosyl)-6-O-[(2′-hydroxyethyl)oxymethyl]-α-D-glucopyranoside, which carries a 2′-hydroxyethyloxymethyl group in place of the 6-O-galactosyl residue, was also synthesized.