The addition of Grignardreagents to ketones using sub-stoichiometric amounts of LaCl 3 ·2LiCl was studied. Catalytic amounts of LaCl 3 ·2LiCl (30 mol%) provide, in most cases, yields similar to those obtained using a stoichiometric amount.
A Convenient Synthesis of 2-Naphthylcyclopentanones and 2-Naphthylcyclohexanones from 1-Naphthylcycloalkenes
作者:Maciej Góra、Michał K. Łuczyński、Janusz J. Sepioł
DOI:10.1055/s-2005-865298
日期:——
The oxidation of naphthylcycloalkenes with hydrogen peroxide or MCPBA followed by acid catalyzed rearrangement of diol (epoxide), afforded a series of naphthylcycloalkanones in a very simple manner. The conditions allow preparation of naphthylcycloalkanones on a multigram scale.
An efficient copper-catalyzed radical ring-opening halogenation with HX (aq) is described. This protocol features redox-neutral conditions, green halogen sources, and a broad substrate scope, providing practical access to distally chlorinated, brominated and iodinated alkyl ketones and alkyl nitriles with moderate to good yields.
Iron-Catalyzed Decarboxylative Olefination of Unstrained Carbon–Carbon Bonds Relying on Alkoxyl Radical Induced Cascade
作者:Pin Gao、Hao Wu、Jun-Cheng Yang、Li−Na Guo
DOI:10.1021/acs.orglett.9b02675
日期:2019.9.6
An iron-catalyzed decarboxylative olefination of unstrained carbon-carbon bonds via alkoxylradical induced C-C bond cleavage is presented. This protocol features mild conditions (room temperature, redox-neutral), good substrate scope and functional group compatibility, as well as excellent stereoselectivity, thus providing a facile access to the distal alkenyl ketones.
developed for the one-pot construction of pyrrolo[1,2-a]quinoxalines via a Cu(II)-catalyzed domino reaction between 2-(1H-pyrrol-1-yl)anilines and alkylsilyl peroxides. This reaction proceeds through C–C bond cleavage and new C–C and C–N bond formation. A mechanistic study suggests that alkyl radical species participate in the cascade reaction.
通过Cu( II ) 催化的 2-(1 H-吡咯-1-基)苯胺和烷基甲硅烷基过氧化物之间的多米诺反应,开发了一种有效的一锅法构建吡咯并[1,2- a ]喹喔啉的方法。该反应通过 C-C 键断裂和新的 C-C 和 C-N 键形成进行。机理研究表明烷基自由基参与级联反应。