In this paper we report the first cross-coupling reaction of Ar3Bi with Ar'X mediated by Pd-NHC complexes by keeping the ability of Ar3Bi to transfer the three aryl moieties. Investigations were carried out in order to minimize the quantity of the side product Ar-Ar coming from the conversion of Ar3Bi. The results showed that PEPPSI IPr was a good catalyst precursor. Efforts were focussed on the rule of each additive such as PPh3 and the base. It was notably found that the presence of PPh3 (ratio PEPPSI IPriPPh(3): 1/1) was essential to keep the process efficient. Therefore NHC-Pd-PPh3 has been assumed as being the catalytic species. Under the optimized reaction conditions the concomitant formation of the undesired biaryl side product was restricted to its inherent formation consecutive to the reduction of the catalyst precursor to Pd(0). In a last study, the scope and the limitation of the new catalytic methodology were examined and a large range of unsymmetrical biaryl compounds Ar-Ar' bearing various substituents from strongly electron-donating to electron-withdrawing ones have been prepared and fully characterized. (C) 2016 Elsevier B.V. All rights reserved.
Coumarin Derivatives Exert Anti-Lung Cancer Activity by Inhibition of Epithelial–Mesenchymal Transition and Migration in A549 Cells
作者:Rodrigo Santos Aquino de Araújo、Julianderson de Oliveira dos Santos Carmo、Simone Lara de Omena Silva、Camila Radelley Azevedo Costa da Silva、Tayhana Priscila Medeiros Souza、Natália Barbosa de Mélo、Jean-Jacques Bourguignon、Martine Schmitt、Thiago Mendonça de Aquino、Renato Santos Rodarte、Ricardo Olímpio de Moura、José Maria Barbosa Filho、Emiliano Barreto、Francisco Jaime Bezerra Mendonça-Junior
DOI:10.3390/ph15010104
日期:——
derivatives and isosteres were synthesized from the reaction of triflic intermediates with phenylboronic acids, terminal alkynes, and organozinc compounds through palladium-catalyzed cross-coupling reactions. The in vitro cytotoxiceffect of the compounds was evaluated against two non-small celllung carcinoma (NSCLC) cell lines (A-549 and H2170) and a normal cell line (NIH-3T3) using cisplatin as a reference
Structure–Activity Relationship and Molecular Mechanisms of Ethyl 2-Amino-6-(3,5-dimethoxyphenyl)-4-(2-ethoxy-2-oxoethyl)-4<i>H</i>-chromene-3-carboxylate (CXL017) and Its Analogues
作者:Sonia G. Das、Balasubramanian Srinivasan、David L. Hermanson、Nicholas P. Bleeker、Jignesh M. Doshi、Ruoping Tang、William T. Beck、Chengguo Xing
DOI:10.1021/jm200764t
日期:2011.8.25
cytotoxicity in the NCI-60 panel of cell lines with an average IC50 of 1.04 μM. In addition, 5 has a unique mechanism of action in comparison with standard agents in the NCI database based on COMPARE analysis. Further structure–activityrelationship study led to the development of a more potent analogue, compound 7d, with an IC50 of 640 nM in HL60/MX2. Additionally, one enantiomer of 5 is 13-fold more active