(S)-3,3-Dimethyl-1-(3-phenyl-propionyl)-5-trityloxymethyl-pyrrolidin-2-one

(2'R,3'R,5R)-(-)-1-(3'-hydroxy-2'-methyl-3'-phenyl-1'-oxopropyl)-3,3,5-trimethyl-2-pyrrolidinone

(5R)-(+)-1-(2',2'-dimethyl-1'-oxopropyl)-5-ethyl-3,3-dimethylpyrrolidin-2-one

(5S)-5-bromomethyl-3,3-dimethylpyrrolidin-2-one

(5R)-(-)-(1'-oxopropyl)-5-ethyl-3,3-dimethylpyrrolidin-2-one