Campeau, Louis-Charles; Stuart, David R.; Leclerc, Jean-Philippe, Journal of the American Chemical Society, 2009, vol. 131, p. 3291 - 3306
作者:Campeau, Louis-Charles、Stuart, David R.、Leclerc, Jean-Philippe、Bertrand-Laperle, Megan、Villemure, Elisia、et al.
DOI:——
日期:——
Catalyst and base controlled site-selective sp2 and sp3 direct arylation of azine N-oxides
作者:Derek J. Schipper、Louis-Charles Campeau、Keith Fagnou
DOI:10.1016/j.tet.2008.12.004
日期:2009.4
Site-selective direct arylation of both sp(2) and sp(3) sites on azine N-oxide substrates is described. The arylation reactions are carried out in either a divergent manner or a sequential manner The sp arylation reaction is applied to the synthesis of the natural products, papaverine and crykonisine, and. rationale for low reactivity of electron-deficient aryl halides is provided. Mechanistic investigations point toward the intimate involvement of the base in the mechanism of these reactions. (C) 2008 Published by Elsevier Ltd.
Site-Selective sp<sup>2</sup> and Benzylic sp<sup>3</sup> Palladium-Catalyzed Direct Arylation
作者:Louis-Charles Campeau、Derek J. Schipper、Keith Fagnou
DOI:10.1021/ja710451s
日期:2008.3.1
Palladium-catalyzed siteselective arylation reactions of both sp2 and benzylic sp3 sites on azine and diazine N-oxide substrates are described that occur in good to excellent yield and with complete selectivity for reaction at the desired position. These studies have uncovered the need to properly control the metal to ligand ratio in sp2 arylation and necessitated a complete reinvestigation of all reaction parameters