Malhotra S, Seng PS, Koenig SG, Deese AJ, Ford KA. Chemoselective sp2-sp3 cross-couplings: iron-catalyzed alkyl transfer to dihaloaromatics.
Org Lett 2013;
15:3698-701. [PMID:
23829418 DOI:
10.1021/ol401508u]
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Abstract
The chemoselective functionalization of a range of dihaloaromatics with methyl, cyclopropyl, and higher alkyl Grignard reagents via iron-catalyzed cross-coupling is described. The site selectivity of C-X (X = halogen) activation is determined by factors such as the position of the halogen on the ring, the solvent, and the nucleophile. A one-pot protocol for the chemoselective synthesis of mixed dialkyl heterocycles is achieved solely employing iron catalysis.
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