intermolecular hydroacylation reaction of alkenes with simple aldehydes has been developed. This reaction offers a new approach to the selective preparation of branched ketones in high yields (up to 99%) and branched selectivities (up to 99:1). Experimental data provide evidence for reversible formation of acyl-nickel-alkyl intermediate, and DFT calculations show that the aldehydeC-H bond transfer
(IPr)Pd(acac)Cl: An Easily Synthesized, Efficient, and Versatile Precatalyst for C−N and C−C Bond Formation
作者:Nicolas Marion、Elise C. Ecarnot、Oscar Navarro、Dino Amoroso、Andrew Bell、Steven P. Nolan
DOI:10.1021/jo060190h
日期:2006.5.1
and IPr·HCl [acac = acetylacetonate; IPr = N,N‘-bis(2,6-diisopropylphenyl)imidazol-2-ylidene], has been developed. The resulting complex, (IPr)Pd(acac)Cl (1), has proven to be a highly active PdII precatalyst in the Buchwald−Hartwig and the α-ketone arylation reactions. A wide range of substrates has been screened, including unactivated, sterically hindered, and heterocyclic aryl chlorides.
Well-Defined, Air-Stable (NHC)Pd(Allyl)Cl (NHC = N-Heterocyclic Carbene) Catalysts for the Arylation of Ketones
作者:Mihai S. Viciu、Romain F. Germaneau、Steven P. Nolan
DOI:10.1021/ol026745m
日期:2002.11.1
A number of palladium-N-heterocycliccarbene (NHC) complexes were found to be active catalysts for the arylation of ketones. A large number of substrates, both aryl halides and ketones, are compatible with the reaction conditions. The ketone arylation reactions are achieved with low catalyst loading in short reaction times using aryl chlorides and triflates as reactive partners. [reaction: see text]
Palladium-Catalyzed α-Ketone Arylation under Mild Conditions
作者:Changsheng Cao、Lingling Wang、Zhengyuan Cai、Lingqiao Zhang、Jin Guo、Guangsheng Pang、Yanhui Shi
DOI:10.1002/ejoc.201001428
日期:2011.3
α-arylation of ketones with aryl halides catalyzed by the easily prepared and air-stable palladium complex (SIPr)-Pd(Py)Cl 2 (3) is described. Complex 3 displays high activity for a variety of aryl halides (activated, unactivated, and sterically hindered aryl halides) under mild conditions. Moreover, both aryl and alkyl ketones can be arylated. The α-arylation of somealkyl ketones can even be run at room
Asymmetric Hydrogenation of Unfunctionalized Tetrasubstituted Acyclic Olefins
作者:Raphael Bigler、Kyle A. Mack、Jeff Shen、Paolo Tosatti、Chong Han、Stephan Bachmann、Haiming Zhang、Michelangelo Scalone、Andreas Pfaltz、Scott E. Denmark、Stefan Hildbrand、Francis Gosselin
DOI:10.1002/anie.201912640
日期:2020.2.10
Asymmetrichydrogenation has evolved as one of the most powerful tools to construct stereocenters. However, the asymmetrichydrogenation of unfunctionalized tetrasubstituted acyclic olefins remains the pinnacle of asymmetric synthesis and an unsolved challenge. We report herein the discovery of an iridium catalyst for the first, generally applicable, highly enantio- and diastereoselective hydrogenation