(2S,4R)-4-(tert-Butyl-dimethyl-silanyloxy)-2-methoxymethyl-2-[3-(toluene-4-sulfonyloxy)-propyl]-pyrrolidine-1-carboxylic acid tert-butyl ester

(2S,4R)-1-(tert-butoxycarbonyl)-4-(tert-butyldimethylsilyloxy)-2-(prop-2-enyl)pyrrolidine-2-methanol

(2S,4R)-2-(3-tert-Butoxycarbonylamino-propyl)-4-(tert-butyl-dimethyl-silanyloxy)-2-methoxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester