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

(2R,3S,4S)-4-tert-butyldimethylsilyloxy-2,3-epoxycyclohexan-1-one

(2R,3S,4S)-4-tert-butyldimethylsilyloxy-2,3-epoxy-6-phenylselenylcyclohexan-1-one

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

(R)-8-Azido-1,4-dioxa-spiro[4.5]dec-6-ene