Nickel-Catalyzed Reductive Conjugate Addition to Enones via Allylnickel Intermediates
作者:Ruja Shrestha、Stephanie C. M. Dorn、Daniel J. Weix
DOI:10.1021/ja309176h
日期:2013.1.16
An alternative method to copper-catalyzed conjugateaddition followed by enolate silylation for the synthesis of β-disubstituted silyl enolether products (R(1)(R(2))HCCH═C(OSiR(4)(3))R(3)) is presented. This method uses haloarenes instead of nucleophilic aryl reagents. Nickel ligated to either neocuproine or bipyridine couples an α,β-unsaturated ketone or aldehyde (R(2)HC═CHC(O)R(3)) with an organic
Reductive Conjugate Addition of Haloalkanes to Enones To Form Silyl Enol Ethers
作者:Ruja Shrestha、Daniel J. Weix
DOI:10.1021/ol200881v
日期:2011.5.20
A new method is presented for tandem reductiveconjugate addition and silyl enol ether formation from cyclic and acyclic enones and enals in the presence of a Mn reductant, a Ni(terpyridine) catalyst, and a trialkylchlorosilane. The addition of secondary, tertiary, and hindered primary haloalkanes is demonstrated. Preliminary studies on the mechanism show that the intermediacy of L1(Ni)(η3-1-triet