Copper- and Phosphine-Ligand-Free Palladium-Catalyzed Direct Allylation of Electron-Deficient Polyfluoroarenes with Allylic Chlorides
作者:Yan-Bo Yu、Shilu Fan、Xingang Zhang
DOI:10.1002/chem.201202824
日期:2012.11.12
copper‐ and phosphine‐ligand‐free Pd‐catalyzed directallylation of electron‐deficient polyfluoroarenes with allylicchlorides and the reaction mechanism are described (see scheme). The simple catalytic system, broad substrate scope, and excellent functional‐group compatibility of this protocol provides a useful and facile access to allylated polyfluoroarenes.
The Fate of Bis(η3-allyl)palladium Complexes in the Presence of Aldehydes (or Imines) and Allylic Chlorides: Stille Coupling versus Allylation of Aldehydes (or Imines)
The mere presence or absence of PPh3 suffices to control the reactivity of bis(η3 -allyl)palladium complexes. In the absence of PPh3 they undergo chemoselective allylic addition to aldehydes or imines, even in the presence of allylic chlorides, whereas in the presence of PPh3 the Stille coupling reaction takes place chemoselectively, even when aldehydes or imines are also present.
Ruthenium-Catalyzed Regio- and Enantioselective Allylic Substitution with Water: Direct Synthesis of Chiral Allylic Alcohols
作者:Naoya Kanbayashi、Kiyotaka Onitsuka
DOI:10.1002/anie.201101078
日期:2011.5.23
Less is more: A new route to access chiralallylic alcohols through the regio‐ and enantioselectivesubstitution of monosubstituted allylic chlorides with water has been developed. The reaction is catalyzed effectively by planar‐chiral cyclopentadienyl ruthenium complexes (see scheme).