Journal
PURE AND APPLIED CHEMISTRY
Volume 86, Issue 3, Pages 345-360Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/pac-2013-1104
Keywords
catalysis; C-heteroatom bond formation; copper; cross-coupling reactions; mechanism; OMCOS-17
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Copper-catalyzed cross-coupling reactions for C-heteroatom bond formation have attracted numerous research groups in the past 15 years aiming at finding more efficient methodologies under milder conditions. The use of auxiliary ligands has tremendously improved Ullmann-type couplings although a general methodology for different heteroatom-nucleophiles is still lacking. Mechanistic insights are seen as a clue for designing new effective, broad-scope and general methodologies. In this review we describe the widely discussed mechanistic options for this reaction and the use of model compounds to unravel key mechanistic aspects for copper-catalyzed C-heteroatom transformations. Stable aryl-Cu(III) species in model systems are shown to be reliable active catalysts in the coupling of a broad nucleophile scope such as phenols, amides, sulfides, selenides, phosphites, halides and also activated methylene susbtrates for carbon-carbon couplings.
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