alkylindium reagents with diaryliodonium salts proceeded efficiently in the presence of tetrakis(triphenylphosphine)palladium [Pd(PPh3)4], 2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl (SPhos), lithium tert-butoxide, and lithium chloride in DMA/THF (1:1) at 100 °C, leading to the corresponding cross-coupling products in moderate to good yield with broad substrate scope and wide functional group tolerance
Functional Group Tolerant Kumada−Corriu−Tamao Coupling of Nonactivated Alkyl Halides with Aryl and Heteroaryl Nucleophiles: Catalysis by a Nickel Pincer Complex Permits the Coupling of Functionalized Grignard Reagents
作者:Oleg Vechorkin、Valérie Proust、Xile Hu
DOI:10.1021/ja9027378
日期:2009.7.22
A nickel(II) pincer complex [((Me)NN(2))NiCl] (1) catalyzes Kumada-Corriu-Tamao crosscoupling of nonactivated alkyl halides with aryl and heteroaryl Grignard reagents. The coupling of octyl bromide with phenylmagnesium chloride was used as a test reaction. Using 3 mol % of 1 as the precatalyst and THF as the solvent, and in the presence of a catalytic amount of TMEDA, the coupling product was obtained