Scope and Mechanism of Palladium-Catalyzed Amination of Five-Membered Heterocyclic Halides
作者:Mark W. Hooper、Masaru Utsunomiya、John F. Hartwig
DOI:10.1021/jo0266339
日期:2003.4.1
Detailed studies have been conducted to determine the activity of palladium catalysts for the amination of five-membered heterocyclic halides and to determine the factors that control the scope of this reaction. Palladium-catalyzed aminations of the electron-rich furanyl, thiophenyl, and indolyl halides and of the related 2-halogenated thiazoles, benzimidazole, and benzoxazole have been shown to occur
已经进行了详细的研究,以确定钯催化剂对五元杂环卤化物胺化的活性,并确定控制该反应范围的因素。富电子的呋喃基,噻吩基和吲哚基卤化物以及相关的2-卤代噻唑,苯并咪唑和苯并恶唑的钯催化胺化反应均与一部分胺一起发生。测试了钯前体和P(t)Bu(3)的各种组合作为3-溴噻吩与N-甲基苯胺反应的催化剂,最快的反应是Pd(I)二聚体[PdBr(P(t)Bu) (3))](2)。噻唑,苯并咪唑和苯并恶唑的最快胺化反应发生在三氟乙酸钯和P(t)Bu(3)的组合催化下。