A short and simple synthetic route to polyhydroxylated piperidines and
pyrrolidines were described with D-glucurono-delta-lactone as chiral
educt. Key reaction steps included selective cleavage of terminal isop
ropylidene group of compound 12 with Dowex 50W-X8 resin (H+ form), reg
ioselective ring opening of epoxide 16 and intramolecular nucleophilic
amination of compound 14 and 18.