Diastereoselective Synthesis of syn-β-Lactams Using Rh-Catalyzed Reductive Mannich-Type Reaction of α,β-Unsaturated Esters
Motoyuki Isoda, Kazuyuki Sato, Masato Funakoshi, Keiko Omura, Atsushi Tarui, Masaaki Omote and Akira Ando*
*Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka 573-0101, Japan, Email: aandopharm.setsunan.ac.jp
M. Isoda, K. Sato, M. Funakoshi, K. Omura, A. Tarui, M. Omote, A. Ando, J. Org. Chem., 2015, 80, 8398-8405.
DOI: 10.1021/acs.joc.5b01233 (free Supporting Information)
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A rhodium-hydride complex (Rh-H), generated from Et2Zn and RhCl(PPh3)3, catalyzes a 1,4-reduction of α,β-unsaturated esters. The resulting rhodium enolate reacted as a Reformatsky-type reagent with various imines to give syn-β-lactams in good to excellent yields with high diastereoselectivity.
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