Copper(I)-imine complexes: Synthesis and catalytic activity in olefin cyclopropanation

摘要: Abstract Different imine-type ligands, prepared by the condensation of anilines or α-methylbenzylamine with 2-pyridinecarboxaldehyde (pyim1,2) 2-quinolinecarboxaldehyde (quim1,2) were prepared. These species act as N,N′-bidentate, chelating ligands upon coordination to Cu(I): treatment [Cu(PPh3)3Cl] an equimolar amount resulted in displacement two molecules PPh3, giving rise formation [Cu(pyim1,2)(PPh3)Cl] (1–2) and [Cu(quim1,2)(PPh3)Cl] (3–4), respectively. The copper derivatives 1–4 proved be highly active catalysts olefin cyclopropanation presence ethyl diazoacetate, even using deactivated olefins (namely, 2-cyclohexen-1-one) substrate. X-ray structure complex 2, [Cu(pyim2)(PPh3)Cl], is also reported.