A stereoselectivesynthesis of 1-deoxynojirimycin, D-glucono-δ-lactam and D-altrono-δ-lactam were accomplished from a commonchiralintermediatederivedfromD-mannitol. The key transformations in the synthesis include Miyashita C-2 selective endo-mode azide opening of epoxy alcohol and Sharpless asymmetric dihydroxylation.