(2S,4R)-4-(tert-butyl-dimethyl-silanyloxymethyl)-2-hydroxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester

(2S,4R)-1-tert-butoxycarbonyl-2-benzyloxymethyl-4-cyanomethylpyrrolidine

(2S,4R)-1-tert-butoxycarbonyl-2-hydroxymethyl-4-[2'-N-(tert-butoxycarbonyl)amino]ethylpyrrolidine

(2S,4R)-2-Benzyloxymethyl-4-(tert-butyl-dimethyl-silanyloxymethyl)-pyrrolidine-1-carboxylic acid tert-butyl ester

(2S,4R)-2-Benzyloxymethyl-4-(toluene-4-sulfonyloxymethyl)-pyrrolidine-1-carboxylic acid tert-butyl ester