Ylide-Functionalized Phosphine (YPhos)–Palladium Catalysts: Selective Monoarylation of Alkyl Ketones with Aryl Chlorides
作者:Xiao-Qiang Hu、Dominik Lichte、Ilja Rodstein、Philip Weber、Ann-Katrin Seitz、Thorsten Scherpf、Viktoria H. Gessner、Lukas J. Gooßen
DOI:10.1021/acs.orglett.9b02830
日期:2019.9.20
phosphine (YPhos) ligands allow the palladium-catalyzed α-arylation of alkylketones with aryl chlorides with record setting activity. Using a cyclohexyl-substituted YPhos ligand, a wide range of challenging ketone substrates was efficiently and selectively monoarylated under mild conditions. A newly designed YPhos ligand bearing tert-butyl groups on the coordinating phosphorus atom is already active
Di-<i>tert</i>-butylneopentylphosphine (DTBNpP): An Efficient Ligand in the Palladium-Catalyzed α-Arylation of Ketones
作者:Steven M. Raders、Jessica M. Jones、Jeffrey G. Semmes、Steven P. Kelley、Robin D. Rogers、Kevin H. Shaughnessy
DOI:10.1002/ejoc.201402474
日期:2014.11
palladium(II) acetate provide an efficient catalytic system for the α-arylation of ketones. Aryl bromides were coupled with ketones using 0.25–0.5 mol-% Pd(OAc)2/DTBNpP in toluene at 50 °C, whereas aryl chlorides required a higher catalyst loading (0.5–2.0 mol-%) and a higher temperature (80 °C). Coupling of 2-bromophenol with ketones using the Pd/DTBNpP system provides an efficient route for the synthesis
PROCESS FOR PREPARING KETONES FROM ALPHA-OXO CARBOXYLATES AND ARYL BROMIDES
申请人:Cotte Alain
公开号:US20090221832A1
公开(公告)日:2009-09-03
A process for preparing ketones of the general formula (III)
where
R is an optionally substituted carbocyclic aromatic radical having 6 to 24 carbon atoms or an optionally substituted alkyl radical or an optionally substituted heteroaromatic radical having 5 to 24 carbon atoms, and
R
1
is an optionally substituted carbocyclic aromatic radical having 6 to 24 carbon atoms or an optionally substituted heteroaromatic radical having 5 to 24 carbon atoms,
by reacting alpha-oxo carboxylates of the general formula (I)
wherein
n and m is a number in the range from 1 to 6,
M
(m+)
is a cation, and
R has the meaning indicated for formula (III),
with aryl bromides of the general formula (II)
R
1
—Br (II)
where
R
1
has the meaning indicated for formula (III),
in the presence of two transition metals or compounds thereof as catalyst, is described.