通过炔烃的氨基钯催化,然后分子内亲核加成生成的碳-钯键到束缚的氰基/醛基上,已经实现了Pd(II)催化的苯并[ a ]咔唑的直接合成。与文献方法相比,这种合成方法操作简单,使用简单的底物,并提供了快速的分子内组装,可直接合成苯并[ a ]咔唑,其中不同位置的取代基耐受性广,足以保留足够的余量。多元化的机会。
this work, a set of structurally diverse synthetic carbazoles was screened for their anticancer activities. According to structure–activity relationship studies, carbazoles with an N-substituted sulfonyl group exhibited better anticancer activity. Moreover, compound 8h was discovered to show the most potent anticancer effects on Capan-2 cells by inducing apoptosis and cell cycle arrest in G2/M phase
Access to Benzo[<i>a</i>]carbazoles and Indeno[1,2-<i>c</i>]quinolines by a Gold(I)-Catalyzed Tunable Domino Cyclization of Difunctional 1,2-Diphenylethynes
The cyclization order of the difunctional 1,2-diphenylethynes was precisely tuned under the catalysis of gold by changing the nitrogen substitution of the substrates, leading to the facile preparation of benzo[a]carbazole and indeno[1,2-c]quinolinederivatives. The mechanisms of these domino cyclizations were probed by control experiments, and an insight into the selectivity of the cyclization was
通过改变底物的氮取代,在金的催化下精确调节了双官能1,2-二苯乙炔的环化顺序,从而轻松制备了苯并[ a ]咔唑和茚并[1,2- c ]喹啉衍生物。通过控制实验探索了这些多米诺环化的机理,并通过密度泛函理论(DFT)计算获得了对环化选择性的深入了解。这项研究代表了访问苯并[ a ]咔唑和茚并[1,2- c ]喹啉的统一而通用的方法。
Palladium-Catalyzed Synthesis of Selectively Substituted Phenanthridine Derivatives
作者:Nicola Della Ca'、Elena Motti、Marta Catellani
DOI:10.1002/adsc.200800512
日期:2008.11.3
Selectivelysubstituted phenanthridine derivatives are obtained by a facile reaction of o-alkylated aryl iodides, o-bromoarenesulfonylanilines and activated olefins in the presence of palladium and norbornene as catalysts. The reaction takes place under mild conditions to give the products in satisfactory yields using readily available starting materials.
A Direct Palladium-Catalyzed Route to Selectively Substituted Carbazoles through Sequential CC and CN Bond Formation: Synthesis of Carbazomycin A
作者:Nicola Della Ca'、Giovanni Sassi、Marta Catellani
DOI:10.1002/adsc.200800421
日期:2008.10.6
one-pot procedure for the catalytic preparation of the biologically interesting class of carbazoles. The new procedure is based on the combined catalysis of palladium and norbornene starting from o-substituted iodoarenes and N-sulfonylated or N-acetylated o-bromoanilines. A well-known member of this class, carbazomycin A, has been successfully prepared.
Transition metal-catalyzed diamination by hydroxylamines is a common approach for making three-membered aziridines, while its use for building the larger N-heterocycles is still underdeveloped. Herein, we report an efficient Pd(0)-catalyzed inter-molecular [4+1] annulation of o-bromo(or chloro)-biaryls with bifunctional secondary hydroxylamines for the one-step assembly of synthetically useful carbazoles
羟胺的过渡金属催化二化是制备三元氮丙啶的常用方法,而其用于构建较大的N-杂环的用途仍未开发。在此,我们报告了一种有效的 Pd(0) 催化的分子间 [4+1] 环化邻溴(或氯)-联芳基与双功能仲羟胺,用于一步组装合成有用的咔唑。值得注意的是,这种多米诺骨牌反应的关键是明智地选择氨基源和 Pd(0)-催化剂,以便在具有不稳定 NO 的羟胺存在下将芳基卤化物氧化加成到 Pd(0)-物种中。键。