Extremely high stereoselectivity was observed in the asymmetric cycloaddition of azidoketen to 1-[(S)-1-t-butoxycarbonylethyl]-3-benzylideneamino-4-phenyl-azetidin-2-ones, which gave rise to the formation of optically pure bis-β-lactams.
N. Hatanaka and I. Ojima, J. Chem. Soc., Chem. Commun., 1981, 344 DOI: 10.1039/C39810000344
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