Synthesis and evaluation of new arylbenzo[b]thiophene and diarylthiophene derivatives as inhibitors of the NorA multidrug transporter of Staphylococcus aureus
摘要:
The synthesis based on palladium catalytic coupling of 38 new-arylated benzo[b]thiophenes or thiophenes is described in a few steps. We also report the direct arylation of the position 3 of the benzo[b]thiophenic structure, a 'one pot' 2,5-heterodiarylation of thiophenes as well as the synthesis of precursors of amino-acids with a 2-arylated benzo[b]thiophene core. These compounds were evaluated on bacteria strains: most of them did not exhibit any antibiotic activity but were found to selectively inhibit the NorA multidrug transporter of Staphylococcus aureus. As such, they restored the activity of the NorA substrates ciprofloxacin against a resistant S. aureus strain in which this efflux pump is over-expressed. (c) 2007 Elsevier Ltd. All rights reserved.
Transition-Metal-Mediated Synthesis of Trifluoroethyl Aryl Ethers
作者:Zhiqiang Weng、Yangjie Huang、Ronglu Huang
DOI:10.1055/s-0035-1560054
日期:——
A series of well-definedcopper(I) fluoroalkoxidecomplexes, [(phen)2Cu][OCH2RF], have been shown to undergo trifluoroethoxylation, pentafluoropropoxylation, and tetrafluoropropoxylation with aryl and heteroarylbromides to generate the corresponding trifluoroethyl, pentafluoropropyl, and tetrafluoropropyl (hetero)aryl ethers in good to excellent yields. The reaction tolerates a variety of functional
Efficient Access to 2-Aryl-3-Substituted Benzo[<i>b</i>]thiophenes
作者:Emilie David、Julie Perrin、Stéphane Pellet-Rostaing、Jérémie Fournier dit Chabert、Marc Lemaire
DOI:10.1021/jo0500378
日期:2005.4.1
Benzo[b]thiophene derivatives are important in part because of their use as selective estrogen receptor modulators. They are usually synthesized by intramolecular cyclization. Here, we propose a method for the synthesis of 2-arylbenzo[b]thiophenes with heteroatoms at the 3-positions directly from the benzo [b]thiophene core by using an aromatic nucleophilic substitution reaction and Heck-type coupling. This methodology provides 2-aryl-3-amino or phenoxybenzo[b]thiophenes in about 35% overall yield in 5 steps.
Corrigendum: Well-Defined Copper(I) Fluoroalkoxide Complexes for Trifluoroethoxylation of Aryl and Heteroaryl Bromides
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.