Chen XY, Xia F, Cheng JT, Ye S. Highly enantioselective γ-amination by N-heterocyclic carbene catalyzed [4+2] annulation of oxidized enals and azodicarboxylates.
Angew Chem Int Ed Engl 2013;
52:10644-7. [PMID:
23943127 DOI:
10.1002/anie.201305571]
[Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Indexed: 11/09/2022]
Abstract
γ-Amination: The title reaction was developed to give the corresponding dihydropyridazinones in good yields with excellent enantioselectivities (see scheme; Mes=2,4,6-trimethylphenyl). The annulation reaction worked well for γ-aryl, γ-alkyl, or γ-alkenyl oxidized enals. Highly enantiopure tetrahydropyridazinones and γ-amino acid derivatives could be easily prepared by chemical transformations of the resulting dihydropyridazinones.
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