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A regioselective glycosylation of 3,6-unprotected mannoside acceptors was investigated. With glycosyl trichloroacetimidate donors, when an excess of trimethylsilyl trifluoromethanesulfonate is used as the catalyst, 6-O-glycosylation exclusively occurred affording a silylated disaccharide that could be involved in a subsequent glycosylation reaction. As an illustration, the fast synthesis of two trisaccharides...
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