Nickel(I) complexes were generated in situ from Ni (PPh3)2Cl2 using activated iron and the complexes combined with N,N′-bis(4-fluorobenzylidene) ethane-1,2-diamine (BFBED) were then used as a catalyst for the 1,4-addition reaction of arylboronic acids to α,β-unsaturated substrates. The reaction proceeded to completion and did not require the addition of a base but the addition of potassium iodide is
Highly Efficient and Reusable Polyaniline-Supported Palladium Catalysts for Open-Air Oxidative Heck Reactions under Base- and Ligand-Free Conditions
作者:Pravin R. Likhar、Moumita Roy、Sarabindu Roy、M. S. Subhas、M. Lakshmi Kantam、B. Sreedhar
DOI:10.1002/adsc.200800329
日期:2008.9.5
Oxidative Heckreactions of arylboronic acids and alkenes are carried out in the presence of polyaniline-supported palladiumcatalysts using air as a co-oxidant to afford the Heck products with excellent yields and selectivities under base- and ligand-free conditions. The catalyst was recovered by simple filtration and used for several cycles with consistent activity.
Cobalt(II)-Catalyzed 1,4-Addition of Organoboronic Acids to Activated Alkenes: An Application to Highly<i>cis</i>-Stereoselective Synthesis of Aminoindane Carboxylic Acid Derivatives
It all adds up: The 1,4‐addition of organoboronicacids to activatedalkenes catalyzed by [Co(dppe)Cl2] is described. A [3+2]‐annulation reaction of ortho‐iminoarylboronic acids with acrylates to give various aminoindanecarboxylicacidderivatives with cis‐stereoselectivity is also demonstrated (see scheme; dppe=1,2‐bis(diphenylphosphino)ethane).