(1R)-(2R)-(3R)-2-(3-[1,3]dioxolan-2-yl-propyl)-1-(2-hydroxy-1-phenyl-ethyl)-piperidine-3-carboxylic acid methyl ester

(3R)-(8R)-(8aS)-8a-(3-[1,3]dioxolan-2-yl-propyl)-5-oxo-3-phenyl-hexahydro-oxazolo[3,2-a]pyridine-8-carboxylic acid methyl ester

2-(3-[1,3]dioxolan-2-yl-propyl)-1-(2-hydroxy-(1R)-phenyl-ethyl)-6-oxo-1,4,5,6-tetrahydro-pyridine-3-carboxylic acid methyl ester

methyl (R,Z)-3-((2-((tert-butyldimethylsilyl)oxy)-1-phenylethyl)amino)-6-(1,3-dioxolan-2-yl)hex-2-enoate

methyl (R)-2-(3-(1,3-dioxolan-2-yl)propyl)-1-(2-((tert-butyldimethylsilyl)oxy)-1-phenylethyl)-6-oxo-1,4,5,6-tetrahydropyridine-3-carboxylate