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The regioselective monosulfonylation of hydroxyl groups of a , 3 and y-cyclodextrins, and its application to regioselective preparation of polysulfonylated cyclodextrins are reviewed . Enzymatic hydrolysis of the regioselectively sulfonylated cyclodextrins with Taka-amylase A gave maltooligosaccharides which were regioselectively modified. These are effective one-step methods for the preparation of specifically activated (sulfonylated) oligosaccharides . Also, the importance of the subsites of the amylase in the interaction with oligosaccharides was evaluated as to the results of this Taka-amylolysis.

Selective synthesis and enzymatic degradation of modified cyclodextrins.