(3S,5R)-5-Methoxymethyl-5-(4-trifluoromethyl-benzyl)-pyrrolidine-1,3-dicarboxylic acid 1-tert-butyl ester

(R)-4-(tert-Butyl-dimethyl-silanyloxy)-2-methoxymethyl-2-(4-trifluoromethyl-benzyl)-pyrrolidine-1-carboxylic acid tert-butyl ester

(2R,4R)-2-Methoxymethyl-4-(toluene-4-sulfonyloxy)-2-(4-trifluoromethyl-benzyl)-pyrrolidine-1-carboxylic acid tert-butyl ester

(2S,4R)-2-Methoxymethyl-4-(toluene-4-sulfonyloxy)-2-(4-trifluoromethyl-benzyl)-pyrrolidine-1-carboxylic acid tert-butyl ester

(2R,4S)-4-Cyano-2-methoxymethyl-2-(4-trifluoromethyl-benzyl)-pyrrolidine-1-carboxylic acid tert-butyl ester