The nickel‐catalyzed α‐arylation of ketones with readily available phenolderivatives (esters and carbamates) provides access to useful α‐arylketones. For this transformation, 3,4‐bis(dicyclohexylphosphino)thiophene (dcypt) was identified as a new, enabling, air‐stable ligand for this transformation. The intermediate of an assumed CO oxidative addition was isolated and characterized by X‐ray crystal‐structure
LIGAND, NICKEL COMPLEX COMPRISING THE LIGAND, AND REACTION USING THE NICKEL COMPLEX
申请人:NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY
公开号:US20160074853A1
公开(公告)日:2016-03-17
An object of the present invention is to provide a method for directly performing arylation (particularly α-arylation) of carbonyl or thiocarbonyl compounds using a more inexpensive phenol derivative and nickel catalyst. Another object of the present invention is to provide a novel nickel catalyst that can be used in this method, and a novel ligand of the nickel catalyst. The novel compounds of the present invention are a compound having a diphosphine skeleton in which a five- or six-membered heterocyclic ring is substituted with two dialkylphosphines and/or dicycloalkylphosphines, or a salt thereof, and a compound having the diphosphine skeleton that is bound to nickel. Moreover, coupling reaction of a carbonyl compound and a phenol derivative can be advanced in the presence of a nickel compound having a monodentate or bidentate dialkylphosphine and/or dicycloalkylphosphine skeleton.
Iridium‐Catalyzed Asymmetric Hydrogenation of
<i>N</i>
‐Alkyl α‐Aryl Furan‐Containing Imines: an Efficient Route to Unnatural
<i>N</i>
‐Alkyl Arylalanines and Related Derivatives.
作者:Javier Mazuela、Thomas Antonsson、Laurent Knerr、Stephen P. Marsden、Rachel H. Munday、Magnus J. Johansson
DOI:10.1002/adsc.201801143
日期:2019.2
High throughput experimentation (HTE) has enabled the rapid identification of ligand/precatalyst combinations that facilitate highly enantioselective hydrogenations of prochiral N‐alkyl α‐aryl ketimines containing a furyl moiety. The chiral amines obtained have proven to be modular precursors in the synthesis of unnatural mono N‐alkylated arylalanines and related derivatives.
Exploiting Aryl Mesylates and Tosylates in Catalytic Mono-α-arylation of Aryl- and Heteroarylketones
作者:Wai Chung Fu、Chau Ming So、On Ying Yuen、Irene Toi Chuk Lee、Fuk Yee Kwong
DOI:10.1021/acs.orglett.6b00643
日期:2016.4.15
The first general palladium catalyst for the catalytic mono-α-arylation of aryl- and heteroarylketones with arylmesylates and tosylates is described. The newly developed indolyl-derived phosphine ligand L7 has been identified to promote this reaction efficiently. The key to success is attributed to the enhanced steric congestion of the catalyst and effective oxidative addition of the C(Ar)–OMs bond
Synthesis of 2-Phenyl-1-(2-thienyl)- and 2-Aryl-1-(2-furyl)ethanones by the S<sub>RN</sub>1 Mechanism. Relative Reactivities of Enolate Ions of Ketones
作者:María T. Baumgartner、Mariana H. Gallego、Adriana B. Pierini