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■ Synthesis and Structure of Glycosylidene Acetals of Galactoside

Hiro Ohtake, Takamasa Iimori, Moto Shiro, and Shiro Ikegami*

*Faculty of Pharmaceutical Sciences, Teikyo University, 1091-1 Suarashi, Sagamiko-machi, Tsukui-gun, Kanagawa 199-0195, Japan

Abstract

Interglycosidic spiro-orthoesters were efficiently prepared from methyl 2,6-di-O-benzylgalactopyranoside and sugar lactones in the presence of methoxytrimethylsilane and a catalytic amount of trimethylsilyl triflate. The structure of the prepared orthoester, galactosylidenegalactoside, was determined by X-Ray crystallographic analysis.