(1S,2R,4S,5R)-2-Bromo-4-(tert-butyl-dimethyl-silanyloxy)-1-hydroxy-6-oxa-bicyclo[3.2.1]octane-3,7-dione

(1S,3R,4R)-3-(tert-Butyl-dimethyl-silanyloxy)-1,4-dihydroxy-5-[(E)-hydroxyimino]-cyclohexanecarboxylic acid methyl ester

methyl (4R,5S,6R)-6-chloro-4,5-bis(trimethylsiloxy)-3-oxocyclohex-1-enecarboxylate

methyl (1S,4R,5S,6S)-6-chloro-1,4,5-trihydroxy-3-oxocyclohexanecarboxylate

methyl (1S,4R,5S,6S)-6-chloro-1-hydroxy-4,5-(isopropylidenedioxy)-3-oxocyclohexanecarboxylate