(S)-2-[(1R,2S)-2-Acetoxy-1-(2-methoxy-acetoxy)-3-oxo-propyl]-aziridine-1-carboxylic acid benzyl ester

(S)-2-[(E)-(1R,2R)-2-Acetoxy-1-(2-methoxy-acetoxy)-pent-3-enyl]-aziridine-1-carboxylic acid benzyl ester

Methoxy-acetic acid (E)-(1R,2R)-2-acetoxy-1-((R)-1-benzyloxycarbonylamino-2-iodo-ethyl)-pent-3-enyl ester

Methoxy-acetic acid (E)-(1R,2R)-2-acetoxy-1-((S)-1-benzyloxycarbonylamino-2-methanesulfonyloxy-ethyl)-pent-3-enyl ester

Methoxy-acetic acid (E)-(1R,2R)-1-((S)-1-benzyloxycarbonylamino-2-methanesulfonyloxy-ethyl)-2-(tert-butyl-dimethyl-silanyloxy)-pent-3-enyl ester