Title: Negishi cross-coupling reactions catalyzed by an aminophosphine-based nickel system : a reliable and general applicable reaction protocol for the high-yielding synthesis of biaryls
Authors : Gerber, Roman
Frech, Christian M.
Published in : Chemistry - a European journal
Volume(Issue) : 17
Issue : 42
Pages : 11893
Pages to: 11904
Publisher / Ed. Institution : Wiley
Issue Date: 2011
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subject (DDC) : 540: Chemistry
Abstract: Treatment of NMP solutions of NiCl(2) with 1,1',1''-(phosphanetriyl)tripiperidine (≈2.05 equiv), dissolved in THF, in air at 25 °C forms a highly active catalytic system for the cross-coupling of a large variety of electronically activated, non-activated, deactivated, and ortho-substituted, heterocyclic, and functionalized aryl bromides and aryl chlorides with diarylzinc reagents. Very high levels of conversion and yields were obtained within 2 h at 60 °C in the presence of only 0.1 mol% of catalyst (based on nickel) and thus at catalyst loadings far lower than typically reported for nickel-catalyzed versions of the Negishi reaction. Various aryl halides-which may contain trifluoromethyl groups, fluorides, or other functional groups such as acetals, ketones, ethers, esters, lactones, amides, imines, anilines, alkenes, pyridines, quinolines, and pyrimidines-were successfully converted into the corresponding biaryls. Electronic and steric variations are tolerated in both reaction partners. Experimental observations indicate that a molecular (Ni(I)/Ni(III)) mechanism is operative.
Departement: Life Sciences and Facility Management
Publication type: Article in scientific Journal
DOI : 10.1002/chem.201101037
ISSN: 0947-6539
URI: https://digitalcollection.zhaw.ch/handle/11475/9850
Appears in Collections:Publikationen Life Sciences und Facility Management

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