A sequential reductive addition/cyclization reaction of allenecarboyxlate, derived from penicillin G, with allyl and benzyl halides was successfully performed by the aid of aluminium metal ad catalytic amounts of PbBr2 and [NiCl2(bipy)] to afford 3-allyl- and 3-benzyl-3-cephems, respectively.
H. Tanaka, S. Sumida, K. Sorajo and S. Torii, J. Chem. Soc., Chem. Commun., 1994, 1461 DOI: 10.1039/C39940001461
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