Aromatization of Enamines Promoted by a Stoichiometric Amount of Palladium(II) Salts: A Novel Method for the Synthesis of Aromatic Amines
作者:Teruhiko Ishikawa、Eiji Uedo、Rie Tani、Seiki Saito
DOI:10.1021/jo001331x
日期:2001.1.1
Enamines (1a-r) prepared from cyclohexanones, cyclohexane-1,3-diones, or tetralones led to arylamines (2a-r) in one pot when treated with a stoichiometric amount of palladium salts [PdCl2-(MeCN)2] in acetonitrile in the presence of triethylamine at room temperature or at elevated temperature, in some cases for 5 min to 2 h. The initial electrophilic attack of palladium chloride on the beta-carbon of
当用化学计量的钯盐[PdCl2-(MeCN)2]在乙腈中处理时,由环己酮,环己烷-1,3-二酮或四氢萘酮制得的烯胺(1a-r)在一个锅中生成芳胺(2a-r)。在三乙胺存在下,在室温或高温下,在某些情况下持续5分钟至2小时。氯化钯对烯胺的β-碳的最初亲电攻击导致了sigma-钯物种(8)引发了一系列的反应(-> 9-> 10-> 11-> 12)进行芳构化得到高产率的2a-r。已经通过诱捕实验证明了这种sigma-钯物种的干预。基于这种反应机理,我们开发了另一种新方法,能够转化具有6-en-2-one骨架的无环化合物(16、23,