Sequential one-pot treatment of easily obtained N-prop-2-ynyl-2-azetidinones with Co2(CO)8 and DMSO–H2O gives under mild conditions N-unsubstituted-β-lactams in good yields and with total retention of stereochemistry.
B. Alcaide, J. Pérez-Castells, B. Sánchez-Vigo and M. A. Sierra, J. Chem. Soc., Chem. Commun., 1994, 587 DOI: 10.1039/C39940000587
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