New N-Heterocyclic Carbene Ligand and Its Application in Asymmetric Nickel-Catalyzed Aldehyde/Alkyne Reductive Couplings
作者:Mani Raj Chaulagain、Grant J. Sormunen、John Montgomery
DOI:10.1021/ja072992f
日期:2007.8.1
chiral N-heterocycliccarbene ligand has been prepared and examined in nickel-catalyzed, asymmetricreductive couplings of aldehydes and alkynes. In comparison with related structures that have been largely examined in asymmetric ring-closing metathesis reactions, the new ligand provides superior yields and enantioselectivities in the nickel-catalyzed reductive couplings. The scope of asymmetric couplings
Friedel-Crafts alkylation of benzene and toluene with olefinic C6 hydrocarbons and esters
作者:Kenneth D. Black、Frank D. Gunstone
DOI:10.1016/0009-3084(95)02517-0
日期:1996.1
To assist our study of the reaction of toluene and other aromatic compounds with methyl oleate and other olefinic esters, benzene and toluene have been alkylated under Friedel-Crafts conditions with hex-1-ene, hex-3-ene, methyl hex-3-enoate and methyl hex-3-enedioate. The products were isolated and identified by NMR and mass spectrometric procedures.
Zukerwanik; Ssidorowa, Zhurnal Obshchei Khimii, 1937, vol. 7, p. 641,642
作者:Zukerwanik、Ssidorowa
DOI:——
日期:——
Catalytic Asymmetric Hydroalkenylation of Vinylarenes: Electronic Effects of Substrates and Chiral N-Heterocyclic Carbene Ligands
作者:Chun-Yu Ho、Chun-Wa Chan、Lisi He
DOI:10.1002/anie.201411882
日期:2015.4.7
An asymmetric tail‐to‐tail cross‐hydroalkenylation of vinylarenes with terminal olefins was achieved by catalysis with NiH complexes bearing chiral N‐heterocyclic carbenes (NHCs). The reaction provides branched gem‐disubstituted olefins with high enantioselectivity (up to 94 % ee) and chemoselectivity (cross/homo product ratio: up to 99:1). Electroniceffects of the substituents on the vinylarenes and