(5R)-3-(tert-butyloxycarbonyl)-5-(1-iodoethyl)-2,2-dimethyloxazolidine

(5R,2E)-3-(tert-butyloxycarbonyl)-2,2-dimethyl-5-(pent-2-enyl)-oxazolidine

(2R,4E)-1-(tert-butyloxycarbonyl)amino-4-hepten-2-ol

benzyl (5'R,3S,5S,6R)-3-[2-(3'-tert-butyloxycarbonyl-2',2'-dimethyloxazolidin-5'-yl)ethyl]-2-oxo-5,6-diphenylmorpholine-4-carboxylate

(2R,4E)-2-(tert-butyldiphenylsilyl)oxy-1-(tert-butyloxycarbonyl)-amino-4-heptene