Intramolecular addition of benzylic radicals onto ketenimines. Synthesis of 2-alkylindoles
作者:Mateo Alajarín、Angel Vidal、María-Mar Ortín
DOI:10.1039/b310593h
日期:——
The inter- and intramolecularaddition of free radicals onto ketenimines is studied. All the attempts to add intermolecularly several silicon, oxygen or carbon centered radicals to N-(4-methylphenyl)-C,C-diphenyl ketenimine were unsuccessful. In contrast, the intramolecularaddition of benzylic radicals, generated from xanthates, onto the central carbon of a ketenimine function with its N atom linked
Copper‐Catalyzed Sequential C(<i>sp</i><sup>2</sup>)−H/C(<i>sp</i><sup>3</sup>)−H Annulation of Indoles with Propargylic Alcohols to Access Hydrobenzo[<i>b</i>]carbazoles
Herein, we describe an efficient copper-catalyzed sequential C(sp2)–H/C(sp3)–H annulation of indoles with propargylic alcohols for the synthesis of diversely functionalized hydrobenzo[b]carbazole scaffolds. The reaction involves a Friedel-Crafts addition, 1,5-H shift, 6π electrocyclization, and dearomatization-aromatization cascade. Importantly, this is the first report of the use of 2-(diarylmethyl)indoles