Asymmetric α-amination of 3-substituted oxindoles using chiral bifunctional phosphine catalysts.
Beilstein J Org Chem 2016;
12:725-31. [PMID:
27340464 PMCID:
PMC4902028 DOI:
10.3762/bjoc.12.72]
[Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Accepted: 04/05/2016] [Indexed: 11/23/2022] Open
Abstract
A highly enantioselective α-amination of 3-substituted oxindoles with azodicarboxylates catalyzed by amino acids-derived chiral phosphine catalysts is reported. The corresponding products containing a tetrasubstituted carbon center attached to a nitrogen atom at the C-3 position of the oxindole were obtained in high yields and with up to 98% ee.
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