Synthesis of DMJ analogs with seven- and eight-membered iminocyclitols

A straightforward synthesis of new hydroxy azepane and azocane with an additional hydroxymethyl side arm (1-deoxymannojirimycin, DMJ analogs) has been achieved from trans-(2S,4R)-4-hydroxyproline via Grignard addition, ring-closing metathesis, and stereoselective osmylation as the key steps.