Ligand- and Base-Free Pd(II)-Catalyzed Controlled Switching between Oxidative Heck and Conjugate Addition Reactions
作者:Sarah E. Walker、Julian Boehnke、Pauline E. Glen、Steven Levey、Lisa Patrick、James A. Jordan-Hore、Ai-Lan Lee
DOI:10.1021/ol400539h
日期:2013.4.19
solvent allows controlled and efficient switching between oxidative Heck and conjugateadditionreactions on cyclic Michael acceptor substrates, catalyzed by a cationic Pd(II) catalyst system. Both reactions are ligand- and base-free and tolerant of air and moisture, and the controlled switching sheds light on some of the factors which favor one reaction over the other.
Two methods for the preparation of 2-cyclohexenones from resin-bound 1,3-cyclohexanedione
作者:Mark E. Fraley、Robert S. Rubino
DOI:10.1016/s0040-4039(97)00631-x
日期:1997.5
The addition of organolithium or Grignard reagents to vinylogous ester resin 1 followed by mild hydrolysis of product resins 2 provides 3-alkyl-2-cyclohexenones in high purity (>95%). Alternatively, conversion of 1 to vinyl triflate resin 4 followed by palladium-mediated couplings with aryl boronic acids and hydrolysis furnishes 3-aryl-2-cyclohexenones in lower yield, but exceptional purity.
Pd-Diimine: A Highly Selective Catalyst System for the Base-Free Oxidative Heck Reaction
作者:Aditya L. Gottumukkala、Johannes F. Teichert、Dorus Heijnen、Niek Eisink、Simon van Dijk、Catalina Ferrer、Adri van den Hoogenband、Adriaan J. Minnaard
DOI:10.1021/jo101942f
日期:2011.5.6
Pd(OAc)(2)/3 is an efficient catalyst system for the base-free oxidative Heck reaction that outperforms the currently available catalysts for the more challenging substrates studied. The catalyst system is highly selective, and works at room temperature with dioxygen as the oxidant.