Palladium-catalyzed acylation reactions of α,β-unsaturated ketones with acylzirconocene chloride: Remarkable control of 1,2- and 1,4-selectivity by the catalyst
作者:Yuji Hanzawa、Nobuhito Tabuchi、Takeo Taguchi
DOI:10.1016/s0040-4039(98)01807-3
日期:1998.10
Palladium-catalyzed reactions of α,β-unsaturated ketones with acylzirconocenechloride showed not only an efficient acyl transfer to α,β-unsaturated ketones but also a remarkable regiochemical control by selecting PdCl2(Ph3)2 or Pd(OAc)2.
reacted with acylzirconocenechloride to give regioselectively 1,4-products under the Pd-catalyzed conditions. In contrast to the reactions of α,β-enones, the presence of a triphenylphosphine ligand brought about the selective formation of 1,4-adduct. By virtue of the phosphine ligand-effect in the addition of an acyl anion to α,β-enones, enantioselective 1,2-addition of acylzirconocenechloride to cyclic