(R)-3-((1S,4S,5S)-5-(4-((tert-butyldimethylsilyl)oxy)butanoyl)bicyclo[2.2.2]oct-2-en-2-yl)-4-isopropyloxazolidin-2-one

(R)-3-((1S,4S,5S)-5-(4-bromobenzoyl)bicyclo[2.2.2]oct-2-en-2-yl)-4-isopropyloxazolidin-2-one

(R)-3-((1R,4R,5R)-5-(4-bromobenzoyl)bicyclo[2.2.2]oct-2-en-2-yl)-4-isopropyloxazolidin-2-one

(R)-4-isopropyl-3-((1S,3R,4S)-3-methyl-2-tosyl-2-azabicyclo[2.2.2]oct-5-en-5-yl)oxazolidin-2-one