nickel-catalyzed cross-electrophile coupling of benzyl alcohols with aromatic bromides has been developed. This deoxygenative cross-coupling occurs under mild reaction conditions at ambient temperature affording diarylmethanes, or 1,3-diarylpropenes from benzyl allyl alcohols. The system demonstrated good chemoselectivity tolerating an assortment of reactive functional groups.
[EN] IRON BISPHENOLATE COMPLEXES AND METHODS OF USE AND SYNTHESIS THEREOF<br/>[FR] COMPLEXES BISPHÉNOLATES DE FER ET LEURS PROCÉDÉS D'UTILISATION ET DE SYNTHÈSE
申请人:UNIV PRINCE EDWARD ISLAND
公开号:WO2013053046A1
公开(公告)日:2013-04-18
The present application, relates to iron bisphenolate complexes and methods of use and synthesis thereof. The iron complexes are prepared from tridentate or tetradentate ligands of Formula I: wherein R1 and R2 are as defined herein. Also provided are methods and processes of using the iron bisphenolate complexes as catalysts in cross-coupling reactions and in controlled radical polymerizations.
Expedient Iron-Catalyzed Coupling of Alkyl, Benzyl and Allyl Halides with Arylboronic Esters
作者:Robin B. Bedford、Peter B. Brenner、Emma Carter、Thomas W. Carvell、Paul M. Cogswell、Timothy Gallagher、Jeremy N. Harvey、Damien M. Murphy、Emily C. Neeve、Joshua Nunn、Dominic R. Pye
DOI:10.1002/chem.201402174
日期:2014.6.23
While attractive, the iron‐catalyzed coupling of arylboron reagents with alkyl halides typically requires expensive or synthetically challenging diphosphine ligands. Herein, we show that primary and secondary alkyl bromides and chlorides, as well as benzyl and allyl halides, can be coupled with arylboronic esters, activated with alkyllithium reagents, by using very simple iron‐based catalysts. The
Exploiting Boron-Zinc Transmetallation for the Arylation of Benzyl Halides: What are the Reactive Species?
作者:Robin B. Bedford、Nicholas J. Gower、Mairi F. Haddow、Jeremy N. Harvey、Joshua Nunn、Rukeme A. Okopie、Rosalind F. Sankey
DOI:10.1002/anie.201202219
日期:2012.5.29
One step Beyond: The transmetallation reactions of ArB(OH)2 and Ar3B3O3 with Et2Zn are far more complicated than previously supposed, with solvent‐dependent equilibria between ArB(OY)2 at one side and [RZn(solv)3][BR4] at the other (see picture). While the role of the highly reactive organozinc cation has not been implicated before, its importance for the activation of an otherwise sluggish class of
Coupling of benzyl halides with aryl Grignard reagents catalyzed by iron(III) amine-bis(phenolate) complexes
作者:Elliott F. Chard、Louise N. Dawe、Christopher M. Kozak
DOI:10.1016/j.jorganchem.2013.03.034
日期:2013.8
ferric chloride in the presence of a base yields FeCl(THF)L1 (1). In the solid state, complex 1 exists as a monomeric iron(III) species with a distorted trigonal bipyramidal geometry. Complex 1 is an air-stable, non-hygroscopic, single-component catalyst for C–C cross-coupling of aryl Grignardreagents with benzyl halides, including chlorides. Moderate to good yields of cross-coupled products can be obtained