Domino C–N Bond Formation via a Palladacycle with Diaziridinone. An Approach to Indolo[3,2-<i>b</i>]indoles
作者:Sudarshan Debnath、Lingli Liang、Mei Lu、Yian Shi
DOI:10.1021/acs.orglett.1c00466
日期:2021.5.7
Palladium-catalyzed C–N bond formation is one of the widely used transformations for the synthesis of structurally diverse N-heterocycles. This work describes an efficientpalladium-catalyzed multiple-C–N bond formation reaction for the synthesis of highly π-conjugated N-heterocycles, indolo[3,2-b]indoles with di-tert-butyldiaziridinone. The reaction likely proceeds through the initial formation of
钯催化的C–N键形成是合成结构多样的N-杂环的一种广泛使用的转化方法。这项工作描述了一种高效的钯催化的多C–N键形成反应,用于合成高度π共轭的N-杂环,吲哚[3,2- b ]吲哚与二叔丁基二氮杂吡啶酮。该反应可能通过亲核氨基palpalation初步形成吲哚稠合的palladacycle并随后进行双酰胺化反应而进行,从而得到吲哚[3,2- b ]吲哚。
<i>N</i>-Methyl Transfer Induced Copper-Mediated Oxidative Diamination of Alkynes
作者:Hon Eong Ho、Kazuaki Oniwa、Yoshinori Yamamoto、Tienan Jin
DOI:10.1021/acs.orglett.6b01067
日期:2016.5.20
diamination of bis(2-aminophenyl)acetylene for the synthesis of the structurally intriguing π-conjugated polyheterocyclic scaffold, 5,10-dihydroindolo[3,2-b]indole (DHII), has been developed under Cu(hfacac)2/O2 oxidation systems. The structure design of bis(2-aminophenyl)acetylene bearing both N,N-dimethylamine and primary amine groups is crucial for constructing the corresponding DHII scaffold. Notably, an
在Cu(hfacac)下开发了一种新颖的双(2-氨基苯基)乙炔分子内氧化加氨方法,用于合成结构吸引人的π-共轭多杂环骨架5,10-二氢吲哚[3,2- b ]吲哚(DHII)。 )2 / O 2氧化系统。带有N,N-二甲基胺和伯胺基团的双(2-氨基苯基)乙炔的结构设计对于构建相应的DHII支架至关重要。值得注意的是,分子间ñ -甲基从氮原子转移Ñ,Ñ-将二甲胺转化为伯胺,这对于成功实施本发明的成环方法是至关重要的步骤。
Synthetic Development and Mechanistic Study on Pd(II)-Catalyzed Cyclization of Enediynes to Benzo[<i>a</i>]carbazoles
Treatment of N,N-dimethyl 2[2-(2-ethynylphenyl)ethynyl]anilines (1) with 10 mol he of palladium chloride and 2 equiv of cupric chloride in refluxing THF gave benzo[a]carbazoles (6) in good yields. A mechanistic study showed that this reaction must proceed through formation of haloindole (7) followed by a palladium(II)-catalyzed atom transfer cyclization reaction to give the benzo[a]carbazoles.