Abstract
Abstract Coupling of the secondary hydroxyl group in the 6-O-benzoyl derivatives 3, 5 and 8, prepared from 2-(trimethylsilyl)ethyl β-D-glucopyranoside (2), 2-acetamido-2-deoxy-β-D-glucopyranoside (4), and 2-acetamido-2-deoxy-β-D-galactopyranoside (6), with methyl (methyl 5-acetamido-4,7,8,9-tetra-O-acetyl-3,5-dideoxy-2-thio-D-glycero-α-D-galacto-2-nonulopyranosid)onate (1) as the glycosyl donor in acetonitrile in the presence of dimethyl(methylthio)sulfonium triflate (DMTST) as a glycosyl promoter, exclusively gave the cx-glycosides at C-2 in 3, at C-3 in 5 and 8, respectively.
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