Nickel‐Catalyzed Domino Heck‐Type Reactions Using Methyl Esters as Cross‐Coupling Electrophiles
作者:Yan‐Long Zheng、Stephen G. Newman
DOI:10.1002/anie.201911372
日期:2019.12.9
used as coupling electrophiles in Ni-catalyzed Heck-type reactions through the challenging cleavage of the C(acyl)-O bond under relatively mild reaction conditions at either 80 or 100 °C. With the σ-NiII intermediate generated from the insertion of acyl NiII species into the tethered C=Cbond, carbonyl-retentive products were formed by domino Heck/Suzuki-Miyaura coupling and Heck/reduction pathways
The first nickel-catalyzed intramolecular hydroacylation/Suzuki cross coupling cascade of o-allylbenzaldehydes with a broad range of phenylboronic acid neopentyl glycol esters has been developed. This strategy shows high regioselectivity and step economy in the construction of two C-C bonds via aldehyde C-H bond activation, affording valuable indanones with high efficiency.
Asymmetric Fluorination of Enamides: Access to α-Fluoroimines Using an Anionic Chiral Phase-Transfer Catalyst
作者:Robert J. Phipps、Kenichi Hiramatsu、F. Dean Toste
DOI:10.1021/ja303959p
日期:2012.5.23
a BINOL-derived phosphate as a chiral anionic phase-transfercatalyst in a nonpolar solvent allows the enantioselective fluorination of enamides using Selectfluor as the fluorinating reagent. We demonstrate that a wide range of stable and synthetically versatile α-(fluoro)benzoylimines can be readily accessed with high enantioselectivity. These compounds have the potential to be readily elaborated into
Ni-Catalyzed Alkene Carboacylation via Amide C–N Bond Activation
作者:James A. Walker、Kevin L. Vickerman、Jenna N. Humke、Levi M. Stanley
DOI:10.1021/jacs.7b06191
日期:2017.8.2
We report Ni-catalyzed formal carboacylation of o-allylbenzamides with arylboronic acid pinacol esters. The reaction is triggered by oxidative addition of an activated amide C–N bond to a Ni(0) catalyst and proceeds via alkene insertion into a Ni(II)–acyl bond. The exo-selective carboacylation reaction generates 2-benzyl-2,3-dihydro-1H-inden-1-ones in moderate to high yields (46–99%) from a variety