Cobalt-Catalyzed Electrophilic Aminations with Anthranils: An Expedient Route to Condensed Quinolines
作者:Jie Li、Eric Tan、Niklas Keller、Yi-Hung Chen、Peter M. Zehetmaier、Andreas C. Jakowetz、Thomas Bein、Paul Knochel
DOI:10.1021/jacs.8b11466
日期:2019.1.9
The reaction of various organozinc pivalates with anthranils provides anilines derivatives, which cyclize under acidic conditions providing condensed quinolines. Using alkenylzinc pivalates, electron-rich arylzinc pivalates or heterocyclic zinc pivalates produces directly the condensed quinolines of which several structures belong to new heterocyclic scaffolds. These N-heterocycles are of particular
novel palladium-catalyzed protocol for the synthesis of 9-arylacridines via tandem reaction of 2-(arylamino)benzonitrile with arylboronic acids in water has been developed with good functional group tolerance. The present synthetic route could be readily scaled up to gram quantity without difficulty. This methodology was further extended to the synthesis of a 4′-OH derivative, which showed estrogenic
A facileoxidative annulation of cyclohexanones and 2‐aminophenyl ketones that uses molecular oxygen as the sole oxidant is described. The reaction provides a direct approach to acridines, a structural motif for a large number of fluorescent sensors, functional materials, ligands, and pharmaceuticals. In the presence of a palladium catalyst, high regioselectivity is observed when using non‐symmetric
Synthesis of Substituted Acridines through a Palladium-Catalyzed Condensation/Cyclization/Tautomerization Sequence
作者:Xiangui Chen、Yanjun Xie、Cheng Li、Fuhong Xiao、Guo-Jun Deng
DOI:10.1002/ejoc.201601553
日期:2017.1.18
An efficient synthesis of 9‐aryl‐substitutedacridines from cyclohexanones and 2‐aminobenzophenones under palladium‐catalyzed conditions was developed. By using molecular oxygen as a green oxidant, various cyclohexanones act as the aryl source to construct the nitrogen‐containing heterocycles through a condensation/cyclization/tautomerization sequence.
<i>tert</i>-Butyl Bromide-Promoted Intramolecular Cyclization of 2-Arylamino Phenyl Ketones and Its Combination with Cu-Catalyzed C–N Coupling: Synthesis of Acridines at Room Temperature
2-arylamino phenyl ketones is established to supersede the traditional high-temperature, strongly acidic conditions and achieve 9-substituted acridines, by virtue of the combination of 2,2,2-trifluoroethanol and tert-butyl bromide. This protocol can be merged well with the preceding Cu-catalyzed intermolecular Chan–Evans–Lam cross-coupling reactions, therefore enabling pot-economic modular synthesis of 9-substituted