Procter RJ, Dunsford JJ, Rushworth PJ, Hulcoop DG, Layfield RA, Ingleson MJ. A Zinc Catalyzed C(sp
3 )-C(sp
2 ) Suzuki-Miyaura Cross-Coupling Reaction Mediated by Aryl-Zincates.
Chemistry 2017;
23:15889-15893. [PMID:
28960610 PMCID:
PMC5915750 DOI:
10.1002/chem.201704170]
[Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Indexed: 11/14/2022]
Abstract
The Suzuki-Miyaura (SM) reaction is one of the most important methods for C-C bond formation in chemical synthesis. In this communication, we show for the first time that the low toxicity, inexpensive element zinc is able to catalyze SM reactions. The cross-coupling of benzyl bromides with aryl borates is catalyzed by ZnBr2 , in a process that is free from added ligand, and is compatible with a range of functionalized benzyl bromides and arylboronic acid pinacol esters. Initial mechanistic investigations indicate that the selective in situ formation of triaryl zincates is crucial to promote selective cross-coupling reactivity, which is facilitated by employing an arylborate of optimal nucleophilicity.
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