The easily available and efficient catalyst containing a benzimidazolium ligand and PdCl2(PPh3)(2) demonstrated excellent catalytic activity to construct the flavones and aurones, respectively. This reaction can be operated under mild conditions, affording the desired products in moderate to good yields. This protocol was used to prepare the flavones and aurones by a slight modification of amines. (C) 2013 Elsevier Ltd. All rights reserved.
Preparative and regiochemical aspects of the palladium-catalyzed carbonylative coupling of 2-hydroxyaryl lodides with ethynylarenes
作者:Pier Giuseppe Ciattini、Enrico Morera、Giorgio Ortar、Sabina Strano Rossi
DOI:10.1016/s0040-4020(01)86572-8
日期:1991.8
The title reaction has been conveniently carried out in DMF at 60-degrees-C under 1 atm of CO pressure using DBU as the base and Pd(OAc)2(DPPF)2 as the catalyst to afford generally mixtures of flavones 4 and aurones 5 in varying yields, depending on the substituents in the both reactants. Factors controlling the regioselectivity for 4 or 5 formation in this and in similar, previously reported, coupling procedures have been examined.