Abstract
[reaction: see text] Iridium-catalyzed reductive coupling of acrylates and imines provides trans beta-lactams with high diastereoselection. The optimal catalyst allows for the synthesis of trans beta-lactams bearing aromatic, alkenyl, and alkynyl side chains. This reaction appears to proceed through a reductive Mannich addition-cyclization mechanism. Examination of substituent effects reveals a linear Hammett correlation for both the N-aryl group on the imine and the aryloxy group on the acrylate, thereby pointing to rate-determining cyclization in the reaction mechanism.
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