Abstract
A pseudodisaccharide, a 5- O-(β- d-mannopyranosyl)-2-deoxystreptamine derivative, was obtained preferentially when 2,3,4-tri- O-allyl-6- O-benzyl-α- d-mannopyranosyl chloride ( 1) was used as the glycosyl donor for coupling with 1,3-di- N-benzyloxycarbonyl-2-deoxystreptamine ( 2) using silver triflate as a promoter in tetrahydrofuran. Complexation of the glycosyl acceptor and the allyl protecting group of the glycosyl donor with the promoter proved important for the regio- and stereo-selective formation of the β-mannopyranosyl linkage.
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