(2S,3S,6R)-6-(4-Benzyloxy-butyl)-2-(3-chloro-propyl)-3-methyl-4-oxo-piperidine-1-carboxylic acid benzyl ester

(S)-2-(tert-Butyl-diphenyl-silanyloxymethyl)-6-oxo-piperidine-1-carboxylic acid benzyl ester

1-phenylmethyl 2-methyl 6-(tert-butyldiphenylsilyloxymethyl)-5,6-dihydro-4H-pyridine-1,2-dicarboxylate

phenylmethyl 6-(tert-butyldiphenylsilyloxymethyl)-2-hydroxymethyl-3-methylpiperidine-1-carboxylate

1-phenylmethyl 2-methyl 6-(tert-butyldiphenylsilyloxymethyl)-3-methylpiperidine-1,2-dicarboxylate