A tetrasaccharide, ␣-D-mannopyranosyl-(1→2)-␣-D-mannopyranosyl-(1→6)-␣-D-mannopyranosyl-(1→6)-D-mannopyranose (1), the repeating unit of the cell-wall mannans of Microsporum gypseum and related species of Trychophyton, was synthesized using 6-O-acetyl-2,3,4-tri-O-benzoyl-␣-D-mannopyranosyl trichloroacetimidate (5) and 2-O-acetyl-3,4,6-tri-O-benzoyl-␣-Dmannopyranosyl trichloroacetimidate (13) as the glycosyl donors in "the inverse Schmidt" procedure.

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A highly efficient synthesis of an octasaccharide, the repeating unit of the cell-wall mannan of AbstractA highly concise and effective synthesis of the mannose octasaccharide repeating unit of the cell-wall mannan of Trichophyton mentagrophytes and T. rubrum was achieved via 6-O-glycosylation of a tetrasaccharide acceptor with a tetrasaccharide donor, followed by deprotection. The key tetrasaccharide (11)