Enantiospecific syntheses are reported for the title pyrrolidines, from carbohydrate precursors. An intermediate in one of the routes, ethyl 2, 3, 6-trideoxy-3, 6-imino-4, 5: 7, 8-di- O-isopropylidene-D-glycero-L-altro-octonate (23), could be converted in two steps into a β- lactam.