Santos AD, El Kaim L, Grimaud L, Ronsseray C. Ugi post-condensation copper-triggered oxidative cascade towards pyrazoles.
Beilstein J Org Chem 2011;
7:1310-4. [PMID:
22043240 PMCID:
PMC3201043 DOI:
10.3762/bjoc.7.153]
[Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Accepted: 08/26/2011] [Indexed: 11/23/2022] Open
Abstract
Pyrazolidinones were prepared in a two-step sequence starting from α-hydrazonocarboxylic acids. After a four-component Ugi coupling, the resulting hydrazone was engaged in a copper triggered [3 + 2] cycloaddition/aerobic oxidation cascade.
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