(2R,3S,4S)-4-tert-butyldimethylsilyloxy-2,3-epoxy-6-hydroxymethyl-5-cyclohexen-1-one

(2R,3S,4S)-6-bromo-4-tert-butyldimethylsilyloxy-2,3-epoxy-5-cyclohexen-1-one

(2R,3S,4S)-4-[(tert-Butyldimethylsilyl)oxy]-2,3-epoxy-5-cyclohexen-1-one

(1R,5S,6S)-5-(tert-Butyl-dimethyl-silanyloxy)-3-methyl-3-phenylselanyl-7-oxa-bicyclo[4.1.0]heptan-2-one

(1R,5S,6S)-3-Bromo-5-(tert-butyl-dimethyl-silanyloxy)-3-phenylselanyl-7-oxa-bicyclo[4.1.0]heptan-2-one