p. 9663 - 9666
(2007/10/03)(1R,3S)-8-Acetyl-6-hydroxy-5-oxo-1-(3-phenyl-propyl)-1,2,3,5,6,7-hexahydro-indolizine-3,6-dicarboxylic acid 6-tert-butyl ester 3-methyl ester
(1R,3S)-8-Acetyl-6-tert-butoxycarbonylamino-5-oxo-1-(3-phenyl-propyl)-1,2,3,5-tetrahydro-indolizine-3-carboxylic acid methyl ester
(1R,3S)-8-Acetyl-5-oxo-1-(3-phenyl-propyl)-1,2,3,5-tetrahydro-indolizine-3,6-dicarboxylic acid 6-tert-butyl ester 3-methyl ester
(2R,4S)-9-Acetyl-6-oxo-2-(3-phenyl-propyl)-10-oxa-5-aza-tricyclo[5.2.1.01,5]decane-4,7-dicarboxylic acid 7-tert-butyl ester 4-methyl ester
(2S,4R)-1-(2-tert-Butoxycarbonyl-2-diazo-acetyl)-5-oxo-4-(3-phenyl-propyl)-pyrrolidine-2-carboxylic acid methyl ester