Asymmetric [2 + 2] cycloaddition of ketene with the aldehydes 1a–g, catalysed by 10 mol% of C2-symmetric bissulfonamide 2a–c–R3Al complexes afforded optically active 4-substituted oxetan-2-ones 3a–g in up to 74% enantiomeric excess.
Y. Tamai, H. Yoshiwara, M. Someya, J. Fukumoto and S. Miyano, J. Chem. Soc., Chem. Commun., 1994, 2281 DOI: 10.1039/C39940002281
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