Grosse S, Pillard C, Massip S, Léger JM, Jarry C, Bourg S, Bernard P, Guillaumet G. Efficient synthesis and first regioselective C-3 direct arylation of imidazo[1,2-b]pyrazoles.
Chemistry 2012;
18:14943-7. [PMID:
23086664 DOI:
10.1002/chem.201202593]
[Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Revised: 09/07/2012] [Indexed: 01/13/2023]
Abstract
Highly regioselective: An efficient synthesis of the imidazo[1,2-b]pyrazole core has been developed, and the first regioselective palladium-catalyzed direct arylation of the C-3 position is described (see scheme). Good to excellent yields were obtained for a wide range of aryl partners with electron-rich and electron-poor substituents. This methodology allows rapid access to a large variety of imidazo[1,2-b]pyrazole products and could open the way to the design of new biologically active compounds.
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