Abstract
Abstract O-(6-O-Benzoyl-β-d-galactopyranosyl)-(1→4)- and O-(2, 3, 4-tri-O-acetyl-β-d-galactopyranosyl)-(1→4)-2, 3, 6-tri-O-benzyl-N-benzyloxycarbonyl-1, 5-dideoxy-1, 5-imino-d-glucitols (4 and 12) were each coupled with methyl (methyl 5-acetamido-4, 7, 8, 9-tetra-O-acetyl-3, 5-dideoxy-2-thio-d-glycero-d-galacto-2-nonulopyranosid)onate (5) in acetonitrile medium in the presence of dimethyl(methylthio)sulfonium triflate (DMTST) or N-iodosuccinimide/trifluoromethanesulfonic acid to give the corresponding α-sialyl-(2 → 3)- and α-sialyl-(2 → 6)-glycosides (6 and 13α), which were converted to novel ganglioside GM3-related trisaccharides (9 and 15) containing N-methyl-1-deoxynojirimycin.
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