Communication
Cobalt-Catalyzed C–H Borylation
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Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
J. Am. Chem. Soc., Article ASAP
DOI: 10.1021/ja500712z
Publication Date (Web): March 3, 2014
Copyright © 2014 American Chemical Society
Abstract
A family of pincer-ligated cobalt complexes has been synthesized and are active for the catalytic C−H borylation of heterocycles and arenes. The cobalt catalysts operate with high activity and under mild conditions and do not require excess borane reagents. Up to 5000 turnovers for methyl furan-2-carboxylate have been observed at ambient temperature with 0.02 mol % catalyst loadings. A catalytic cycle that relies on a cobalt(I)–(III) redox couple is proposed.
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