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
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).
Air-tolerant, ligand-free nickel-catalyzed, manganese-assisted reductive Heck reaction of alkyl/aryl halides with electron-deficient olefins
作者:Minling Xü、Lijia Qian、Gang Zou
DOI:10.1016/j.mcat.2023.113291
日期:2023.8
An air-tolerant reductiveHeckreaction of alkyl/arylhalides with α, β-unsaturated esters, nitriles and amides catalyzed by simple nickel bromide has been developed by using manganese as reductant in refluxing acetonitrile. Water plays a double-face role in the catalytic process, hydrolysis of the enolate and/or C-tautomer intermediates to afford the conjugate adducts while suppressing the catalysis