(S)-5-Benzyloxymethyl-3-[1-hydroxy-meth-(E)-ylidene]-2-oxo-pyrrolidine-1-carboxylic acid tert-butyl ester

(S)-1-(4-Methoxy-benzyl)-5-oxo-pyrrolidine-2-carbaldehyde

(+)-trans-5-allylhexahydroindolizidin-3-one

(R)-5-(4,4-Dimethoxy-butyl)-pyrrolidin-2-one

5-methoxyhexahydroindolizidin-3-one