(1S,6R)-3-(2,2,2-trifluoro-acetyl)-3,8-diaza-bicyclo[4.2.0]octane-8-carboxylic acid tert-butyl ester

(1S,6R)-8[(1R)-1-phenyl-ethyl]-3,8-diaza-bicyclo[4.2.0]octane-3-carboxylic acid tert-butyl ester

(1S,6R)-2,2,2-trifluoro-1-[8[(1R)-1-phenyl-ethyl]-3,8-diaza-bicyclo[4.2.0]oct-3-yl]-ethanone

(3S,4S)-4-hydroxymethyl-3-[(1R)-1-phenyl-ethylamino]-piperidine-1-carboxylic acid tert-butyl ester

(R)-N-Boc-4-ethyloxycarbonyl-3-(1-phenylethylamino)-5,6-dihydropyridine