Armed-disarmed concept glycals

The armed-disarmed concept, although discovered with 0-pentenyl glycosides, has been found to be applicable to many other classes of glycosides such as thioglycosides [6], selenoglycosides [39], fluorides [40], phosphoroamidates [41], substituted thioformimidates [42], glycals [21], y-benzoxazolyl (SBox), and 5-thiazolinyl (STaz) [43, 44]. 

The concept of armed/disarmed glycosyl donors was subsequently extended by other groups to thioglycosides21 and selenoglycosides.64 A similar strategy has been used by Friesen and Danishefsky to achieve chemoselectivity in electrophilic addition to glycal double bonds.65... 

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