(2R,3R,6S)-6-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-formyl-3-methyl-piperidine-1-carboxylic acid methyl ester

(S)-6-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-5,6-dihydro-4H-pyridine-1,2-dicarboxylic acid dimethyl ester

(2S,3R,6S)-6-(2-Hydroxy-ethyl)-2-(3-methoxymethoxy-propyl)-3-methyl-piperidine-1-carboxylic acid methyl ester

(2S,3R,6S)-6-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-(3-hydroxy-propyl)-3-methyl-piperidine-1-carboxylic acid methyl ester

(2S,3R,6S)-6-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-(3-methoxymethoxy-propyl)-3-methyl-piperidine-1-carboxylic acid methyl ester