methyl (2S,3S)-2-((S)-1-acetoxy-2-methylpropyl)-5-oxo-3-((tetrahydro-2H-pyran-2-yl)oxy)pyrrolidine-2-carboxylate

1-(tert-butyl) 2-methyl (2S,3S)-2-((S)-1-acetoxy-2-methylpropyl)-5-oxo-3-((tetrahydro-2H-pyran-2-yl)oxy)pyrrolidine-1,2-dicarboxylate

(4R,5S)-3-benzyl-4-(((tert-butyldimethylsilyl)oxy)methyl)-5-isopropyloxazolidine-4-carbaldehyde

(R)-1,2,2-triphenyl-2-((trimethylsilyl)oxy)ethyl (2R,3S)-3-((4S,5S)-3-benzyl-4-(((tert-butyldimethylsilyl)oxy)methyl)-5-isopropyloxazolidin-4-yl)-3-hydroxy-2-methylpropanoate

(2R,3S)-1-tert-butyl 2-methyl 2-((S)-1-acetoxy-2-methylpropyl)-3-(tert-butyldimethylsilyloxy)-5-oxopyrrolidine-1,2-dicarboxylate