(2S,3R)-1-(tert-butyldimethylsilanyloxy)-2-dibenzylamino-5-[1,3]dioxolan-2-yl-pentan-3-ol

(2S,3S)-2-(tert-Butyl-diphenyl-silanyloxymethyl)-3-hydroxy-piperidine-1-carboxylic acid tert-butyl ester

(2S,3R)-3-hydroxy-2-(hydroxymethyl)piperidine-1-carboxylic acid tert-butyl ester

(S)-2-(tert-Butyl-diphenyl-silanyloxymethyl)-3-oxo-piperidine-1-carboxylic acid tert-butyl ester

(1S,4S)-4-(1-methoxymethoxyallyl)-2,2-dimethyloxazolidine-3-carboxylic acid tert-butyl ester