Solvent-Dependent Regioselective Oxidation oftrans-Chalcones using Aqueous Hydrogen Peroxide
摘要:
A novel method for regioselective oxidation of trans-chalcones with hydrogen peroxide in acetonitrile to afford cinnamic acids is reported. Only trans-beta-arylacrylic acids were observed. A wide range of functionalized products can be effectively produced from various chalcones in good to excellent yields.
values. Samples with Ch11 and Ch13 showed significant negative correlationbetween TAS and TOS (p < 0.05 for both), but in Ch14 sample the negative correlation existed between TAS and PAB (p < 0.05). CONCLUSION Lower value of OS (i.e. better antioxidative potency) was noticed in samples with Ch11-Ch15. Electron-donor effects of substituent groups as a structural part of these chalcones could explain
One-pot synthesis of 2-(2-hydroxyaryl)quinolines: reductive coupling reactions of 2′-hydroxy-2-nitrochalcones
作者:Ana I.R.N.A Barros、Artur M.S Silva
DOI:10.1016/s0040-4039(03)01374-1
日期:2003.7
A one-pot synthesis of novel 2-(2-hydroxyaryl)quinolines have been developed from the intramolecular reductivecouplingreactions of 2′-hydroxy-2-nitrochalcones, induced by stannous chloride in acidic medium (HCl/AcOH). In some cases these transformations can be performed with ammonium formate/Pd–C in methanol.
Elevated expression of anti-apoptotic proteins, such as Bcl-2 and Mcl-1 contributes to poor prognosis and resistance to current treatment modalities in multiple cancers. Here, we report the design, synthesis and characterization of benzimidazole chalcone and flavonoid scaffold-derived bicyclic compounds targeting both Bcl-2 and Mcl-1 by optimizing the structural differences in the binding sites of both these proteins. Initial docking screen of Bcl-2 and Mcl-1 with pro-apoptotic protein Bim revealed possible hits with optimal binding energies. All the optimized bicyclic compounds were screened for their in vitro cytotoxic activity against two oral cancer cell lines (AW8507 and AW13516) which express high levels of Bcl-2 and Mcl-1. Compound 4d from the benzimidazole chalcone series and compound 6d from the flavonoid series exhibited significant cytotoxic activity (IC50 7.12 μM and 17.18 μM, respectively) against AW13516 cell line. Time Resolved-Fluorescence Resonance Energy Transfer (TR-FRET) analysis further demonstrated that compound 4d and compound 6d could effectively inhibit the Bcl-2 and Mcl-1 proteins by displacing their BH3 binding partners. Both compounds exhibited potent activation of canonical pathway of apoptosis evident from appearance of cleaved Caspase-3 and PARP. Further, treatment of oral cancer cells with the inhibitors induced dissociation of the BH3 only protein Bim from Mcl-1 and Bak from Bcl-2 but failed to release Bax from Bcl-xL thereby confirming the nature of compounds as BH3-mimetics selectively targeting Bcl-2 and Mcl-1. Our study thus identifies bicyclic compounds as promising candidates for anti-apoptotic Bcl-2/Mcl-1 dual inhibitors with a potential for further development.
Reichel; Hempel, Justus Liebigs Annalen der Chemie, 1959, vol. 625, p. 184,193
作者:Reichel、Hempel
DOI:——
日期:——
Synthetic chalcones, flavanones, and flavones as antitumoral agents: Biological evaluation and structure–activity relationships
作者:Mauricio Cabrera、Macarena Simoens、Gabriela Falchi、M. Laura Lavaggi、Oscar E. Piro、Eduardo E. Castellano、Anabel Vidal、Amaia Azqueta、Antonio Monge、Adela López de Ceráin、Gabriel Sagrera、Gustavo Seoane、Hugo Cerecetto、Mercedes González
DOI:10.1016/j.bmc.2007.03.031
日期:2007.5
A series of synthetic chalcones, flavanones, and flavones has been synthesized and evaluated for antitumor activity against the human kidney carcinoma cells TK-10, human mammary adenocarcinoma cells MCF-7 (estrogen receptor-positive), and human colon adenocarcinoma cells HT-29. The most active series is the chalcone ones with the best results against TK-10 and HT-29 cells. Fourteen out of 53 analyzed compounds resulted very active against at least two of the studied tumoral cells. Alkaline single cell gel electrophoresis, comet assay, was performed as a study of the chromosomal aberrations promoted by the compounds on normal cells. Four active and two inactive chalcones were studied in the comet assay against normal human kidney cells (HK-2). A structure-activity relationship analysis of these compounds was performed and for 4- and 3,4-disubstituted derivatives a quantitative correlation was obtained in the case of anti-HT-29 activity. (c) 2007 Published by Elsevier Ltd.