A novel ferrocene tethered polymer supported ionic liquid phase catalyst has been synthesized and successfully applied for intramolecular O-arylation of o-iodoanilides to corresponding benzoxazoles. The catalyst was easily recovered by simple filtration that greatly simplified the purification step and resulted in quantitative yields, without ionic liquid impurities in the products. (C) 2013 Elsevier Ltd. All rights reserved.
Efficient palladium-catalyzed direct arylation of azines and diazines using ligand-free conditions
作者:Luca Basolo、Egle M. Beccalli、Elena Borsini、Gianluigi Broggini
DOI:10.1016/j.tet.2009.02.025
日期:2009.4
The use of the palladium-catalyzed direct arylation was successfully tested on different electron-deficient heterocycles. The results demonstrate the effectiveness of the method based on the intramolecular coupling reaction providing polyazacyclic systems. This new application was obtained by using ligand-free conditions with the mixture of Pd(OAc)(2) and TBAC as catalytic system. With suitable substrates different products arising from regioselective coupling were observed. (C) 2009 Elsevier Ltd. All rights reserved.