Efficient Synthesis of α-Aryl Esters by Room-Temperature Palladium-Catalyzed Coupling of Aryl Halides with Ester Enolates
作者:Morten Jørgensen、Sunwoo Lee、Xiaoxiang Liu、Joanna P. Wolkowski、John F. Hartwig
DOI:10.1021/ja027643u
日期:2002.10.1
arylation of alpha,alpha-disubstituted esters were developed with LiNCy(2) as base and P(t-Bu)(3) as ligand. In addition, tert-butyl esters, such as those of Naproxen and Flurbiprofen, were prepared from tert-butyl propionate and aryl bromides in high yields in the presence of Pd(dba)(2) and the hindered, saturatedheterocycliccarbene ligand precursor.
On the Mechanism of the Palladium-Catalyzed β-Arylation of Ester Enolates
作者:Paolo Larini、Christos E. Kefalidis、Rodolphe Jazzar、Alice Renaudat、Eric Clot、Olivier Baudoin
DOI:10.1002/chem.201103153
日期:2012.2.13
palladium‐catalyzed β‐arylation of ester enolates with arylbromides was studied both experimentally and computationally. First, the effect of the ligand on the selectivity of the α/β‐arylation reactions of ortho‐ and meta‐fluorobromobenzene was described. Selective β‐arylation was observed for the reaction of o‐fluorobromobenzene with a range of biarylphosphine ligands, whereas α‐arylation was predominantly
α-Arylation of Esters and Ketones Enabled by a Bench-Stable Pd(I) Dimer Catalyst
作者:Franziska Schoenebeck、Theresa Sperger
DOI:10.1055/s-0037-1610087
日期:2018.11
Published as part of the Special Section dedicated to Scott E. Denmark on the occasion of his 65th birthday Abstract A procedure for the α-arylation of α,α-disubstituted esters and ketones to generate quaternary carbon centers is described. The developed protocol is operationally simple and employs an air- and moisture-stable dinuclear Pd(I) complex [Pd(μ-I)(Pt-Bu3)]2 to mediate selective α-arylation
发布时间作为的一部分奉献给斯科特E.丹麦在他65之际特科次生日 抽象的 描述了α,α-二取代的酯和酮的α-芳基化以生成季碳中心的方法。所开发的方案操作简单,并采用了空气和水分稳定的双核Pd(I)络合物[Pd(μ-I)(P t -Bu 3)] 2来介导芳香族C–I / Br的选择性α-芳基化存在芳族C–Cl和/或C–OTf位点的碳键。 描述了α,α-二取代的酯和酮的α-芳基化以生成季碳中心的方法。所开发的方案操作简单,并采用了空气和水分稳定的双核Pd(I)络合物[Pd(μ-I)(P t -Bu 3)] 2来介导芳香族C–I / Br的选择性α-芳基化存在芳族C–Cl和/或C–OTf位点的碳键。
α-Arylation of Esters Catalyzed by the Pd(I) Dimer {[P(<i>t-</i>Bu)<sub>3</sub>]PdBr}<sub>2</sub>
作者:Takuo Hama、John F. Hartwig
DOI:10.1021/ol8002578
日期:2008.4.1
Conditions for the coupling of bromoarenes with esters using a single base and catalyst with improved turnovernumbers are described. These general conditions were made possible by using the Pd(I) catalyst [P(t-Bu)3]PdBr}2. Reactions of acetates, propionates, and isobutyrates are presented, and reactions of all three classes of esters on a 10 g scale are described.