Abstract
| - A new route to synthesize septanoside derivatives from protected 2-hydroxyglycals is reported. Ringexpansion of a pyranoside to a septanoside was achieved through key reactions of a cyclopropanation,ring opening, oxidation, and reduction. Methyl septanoside derivatives, namely, methyl α-d-glycero-d-talo-septanoside and methyl α-d-glycero-l-altro-septanoside, were synthesized in an overall yield of35% and 46%, respectively, from the corresponding protected 2-hydroxy glycals.
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