Bheeter CB, Bera JK, Doucet H. Palladium-catalyzed direct arylation of thiophenes bearing SO2R substituents.
J Org Chem 2011;
76:6407-13. [PMID:
21696197 DOI:
10.1021/jo200918n]
[Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The palladium-catalyzed direct arylation of SO(2)R-substituted thiophene derivatives was found to proceed regioselectively at C5 and in high yields using a variety of aryl bromides and as low as 0.5-0.1 mol % of phosphine-free Pd(OAc)(2) as the catalyst. For these reactions, sulfonyls, sulfonamides, or even a sulfonic ester as the thiophene substituents were successfully employed.
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