1-tert-butyl (2S,5R)-6-azido-2-[N-(tert-butoxycarbonyl)-amino]-5-hydroxyhexanoate

methyl (2S)-2-benzyloxycarbonylamino-6-bromo-5-oxohexanoate

(2S,5R)-5-azidomethyl-2-benzyloxycarbonylamino-δ-valerolactone

methyl (S)-6-azido-2-benzyloxycarbonylamino-5-oxohexanoate

methyl 3,4-dideoxy-6-O-tosyl-α-D-erythro-hex-3-enopyranoside