An efficient phosphine-free palladium coupling for the synthesis of new 2-arylbenzo[b]thiophenes
摘要:
Straightforward and rapid access to 2-arylbenzo[b]thiophenes has been developed. It involved a catalytic coupling of 3-activated benzo[b]thiophenes with several aryl halides in the presence of a phosphine-free palladium system. In case of fragile functional groups such as aldehydes, a quaternary ammonium was used as an additive as with the other substrates, the coupling performed better and faster in the presence of a crown ether, the best one being DCH-18-C-6, with good yields and low reaction times. This method would provide a direct access to novel structures of biological interest. (C) 2004 Elsevier Ltd. All rights reserved.
An efficient phosphine-free palladium coupling for the synthesis of new 2-arylbenzo[b]thiophenes
作者:Jérémie Fournier Dit Chabert、Lionel Joucla、Emilie David、Marc Lemaire
DOI:10.1016/j.tet.2004.02.011
日期:2004.3
Straightforward and rapid access to 2-arylbenzo[b]thiophenes has been developed. It involved a catalytic coupling of 3-activated benzo[b]thiophenes with several aryl halides in the presence of a phosphine-free palladium system. In case of fragile functional groups such as aldehydes, a quaternary ammonium was used as an additive as with the other substrates, the coupling performed better and faster in the presence of a crown ether, the best one being DCH-18-C-6, with good yields and low reaction times. This method would provide a direct access to novel structures of biological interest. (C) 2004 Elsevier Ltd. All rights reserved.