The first hetero-bifunctionalization of the secondary face of (beta)-cyclodextrin: selective and efficient conversion of the A-ring of a 2A,2B-disulfonate to 2A,3A-epoxymannoside

The A-ring of 2A,2B-O,O-di(mesitylenesulfonyl)-(beta)-cyclodextrin was converted to 2A,3A-epoxymannoside without affecting the other sulfonylated residue, which affords the first approach to hetero-bifunctionalization at the secondary hydroxyl side of cyclodextrins