Synthesis and Biochemical Evaluation of a Series of Aminoflavones as Potential Inhibitors of Protein-Tyrosine Kinases p56lck, EGFr, and p60v-src
摘要:
A series of nitroflavones, 8a-p, and their corresponding aminoflavone hydrochloride salts, 10a-p, was synthesized. The preparation of nitroflavones 8b-i,o,p began with commercially available o-hydroxyacetophenones 2b-f which were converted to o-hydroxynitroacetophenones 3a-h via a variety of nitration methods, followed by condensation with nitrobenzoyl chlorides and cyclization under acidic condition. The nitroflavones 8aj-n were prepared by nitration of the corresponding flavones 7a-e. These new compounds were evaluated for their abilities to inhibit the in. vitro protein-tyrosine kinase activities of p56(1ck), EGFr, and p60(v-src), and all of the active compounds were amino-substituted flavones. None of the nitroflavones inhibited the enzymes. The most active substance in this series against p56(lck) was compound 10j, which had an IC50 of is mu M. When tested versus EGFr, compounds 10a,m displayed IC50's of 8.7 and 7.8 mu M, respectively. Against p60(v-src), 10a,m showed IC50 values of 28.8 and 38.4 mu M, respectively.
Apigenin Bioisosteres: Synthesis and Evaluation of their Antioxidant, Antimicrobial, and Anticancer Activities
摘要:
Abstract:
A novel series of Apigenin bioisosteres [1(4-chlorophenyl)-3-phenyl prop-2-ene-1-one]
non-cyclic derivatives (4a-4c) and [7-hydroxy-2-phenyl-4H-chromen-4-one] cyclic derivatives (9a-
9d) were synthesized. The newly synthesized apigenin bioisosteres were confirmed using UV, IR,
NMR, and mass spectroscopic methods. The antioxidant, antibacterial, and anti-cancer activities of all
newly synthesized compounds were assessed using the DPPH free radical scavenging capacity, disc
diffusion method, and in vitro MTT assay on the human breast cancer MCF-7 cell line. Almost all the
synthesized apigenin bioisosteres had greater antioxidant and antimicrobial activity than standard
Apigenin. Out of seven compounds (4a-4c and 9a-9d), five compounds were found to exhibit notable
antiproliferative activity on the breast cancer cell line (MCF-7), whereas two compounds, 9c and 9d,
did not show notable activity. Our analysis suggests that synthesized Apigenin bioisosteres function
as prospective antioxidant, antimicrobial, and anticancer agents.
A method for the facile synthesis of ring-A hydroxylated flavones
作者:Mark Cushman、Dhanapalan Nagarathnam
DOI:10.1016/s0040-4039(00)97100-4
日期:1990.1
A general method for the facilesynthesis of ring-A hydroxylatedflavones is described. Treatment of the hydroxylated acetophenones 6a–d with enough lithium bis(trimethyl)silyl amide to deprotonate all of the phenols as well as to generate the lithium enolate of the ketone, followed by addition of the acid chlorides 7a–d, gave the 1,3-diketones 8a–g, which were cyclized to the desired products 9a–g
Increasing parasite resistance to nearly all available antimalarial drugs becomes a serious problem to human health and necessitates the need to continue the search for new effective drugs. Recent studies have shown that clinically utilized HIV-1 protease (HIV-1 PR) inhibitors can inhibit the in vitro and in vivo growth of Plasmodium falciparum. In this study, a series of chromone derivatives possessing HIV-1 PR inhibitory activity has been tested for antimalarial activity against P. falciparum (K1 multi-drug resistant strain). Chromone 15, the potent HIV-1 PR inhibitor (IC50 = 0.65 mu M), was found to be the most potent antimalarial compound with IC50 = 0.95 mu M while primaquine and tafenoquine showed IC50 = 2.41 and 1.95 mu M, respectively. Molecular docking study of chromone compounds against plasmepsin II, an aspartic protease enzyme important in hemoglobin degradation, revealed that chromone 15 exhibited the higher binding affinity (binding energy = -13.24 kcal/mol) than the known PM II inhibitors. Thus, HIV-1 PR inhibitor in chromone series has the potential to be a new class of antimalarial agent. (C) 2014 Elsevier Inc. All rights reserved.
A rational approach to the design of flavones as xanthine oxidase inhibitors
作者:L Costantino、G Rastelli、A Albasini
DOI:10.1016/0223-5234(96)85878-8
日期:1996.1
In the light of previous QSAR studies on flavones as inhibitors of xanthine oxidase, we synthesized and tested a new series of 7-hydroxyflavones carrying a wide and balanced variety of substituents (pi, sigma(p)) at the 4' position in order to explore the effect of substituents at this position on the xanthine oxidase inhibitory activity. The results of pK(a) determinations show that the electronic effects of the substituents are not transferred to the hydroxyl at C7, previously found to be fundamental for activity. An excellent correlation is found between molar refractivity of the substituents and the inhibitory activity. These results, applied to the more active 5,7-dihydroxyflavones, allowed the design and synthesis of a very active inhibitor, with an IC50 in the nanomolar range. On interpretative grounds, C4' substituents of flavones are involved in dispersion interactions with the enzyme. The calculation of quantum chemical polarizabilities and solvent accessible surface areas suggests the existence of pi-pi stacking interactions with an aromatic aminoacidic residue of the enzyme.
CUSHMAN, MARK;NAGARATHNAM, DHANAPALAN, TETRAHEDRON LETT., 31,(1990) N5, C. 6497-6500