Palladium-Catalyzed Homocoupling Reactions between Two Csp<sup>3</sup>−Csp<sup>3</sup> Centers
作者:Aiwen Lei、Xumu Zhang
DOI:10.1021/ol0258536
日期:2002.7.1
see text] A novel palladium-catalyzed coupling reaction between two Csp(3)-Csp(3) centers has been investigated. This protocol is initiated by the oxidative addition of an alpha-halo carbonyl compound to a palladium(0) species, followed by the double transmetalation. The key dialkyl palladium intermediate undergoes reductive elimination to form the desired coupling product.
A novel bond formation through oxidative cross-coupling with desyl chloride as the oxidant has been investigated. The coupling can be carried out under mild conditions. The Csp3-center carbon was involved even in the presence of a β-H, and up to 90% of the desired cross-coupling product was obtained with the secondary Csp3-center substrate.
A number of derivatives of 1,4-diphenylbutane have been prepared using a simple one-step process from styrene and α-methylstyrene. The n.m.r. spectra of the products are included.