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Synthesis of beta-lactams from a N-rhenaimine: effect of the transition metal on the energetic profile of the Staudinger reaction

Hevia, E and Perez, J and Riera, V and Miguel, D and Campomanes, P and Menendez, M I and Sordo, T L and Garcia-Granda, S (2003) Synthesis of beta-lactams from a N-rhenaimine: effect of the transition metal on the energetic profile of the Staudinger reaction. Journal of the American Chemical Society, 125 (13). pp. 3706-3707. ISSN 0002-7863

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Abstract

As depicted in the scheme, the alkylidenamido complex 1, a N-rhenaimine, reacts with ketenes to afford the β-lactams 2−4, which possess a {Re(CO)3(bpy)} fragment as substituent at nitrogen. Clean demetalations using HOTf or MeOTf yield the free β-lactams or N-methyl-β-lactams along with [Re(OTf)(CO)3(bpy)]. DFT calculations help to rationalize why the reaction is faster than those of non transition metal N-substituted imines.