Azasugars (also called iminosugars) are compounds in which the ring O-atom of a carbohydrate is replaced by nitrogen. 1 They constitute an important class of glycosidase inhibitors that are receiving a great deal of attention because of their therapeutic potential in the treatment of viral infections including HIV, 2 cancer, 3 diabetes, 4 and other metabolic disorders. 5 In particular, inhibitory activities have been reported for many naturally occurring ...