Comelles J, Moreno-Mañas M, Pérez E, Roglans A, Sebastián RM, Vallribera A. Ionic and Covalent Copper(II)-Based Catalysts for Michael Additions. The Mechanism.
J Org Chem 2004;
69:6834-42. [PMID:
15387609 DOI:
10.1021/jo049373z]
[Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cu(SbF6)2-AdamBox and copper(II) bis-(5-tert-butylsalicylaldehydate) catalyze the Michael addition in neutral media. Mechanistic studies, based on UV-vis, IR, and electrospray ionization mass spectrometry (ESI-MS), suggest that copper enolates of the beta-dicarbonyl formed in situ are the active nucleophilic species.
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