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ABSTRACT: A series of fluconazole analogues containing 1,2,3-triazole fragment have been designed and synthesized on the basis of the active site of the cytochrome P450 14α-demethylase (CYP51). Their structures were characterized by (1)H NMR, (13)C NMR and LC-MS. The MIC80 values indicate that the target compounds 1a-r showed higher activities against nearly all the fungi tested to some extent except against Aspergillus fumigatus. Compounds 1c, e, f, l and p showed 128 times higher activity (with the MIC80 value of 0.0039 mg/mL) than that of fluconazole against Candida albicans and also showed higher activity than that of the other positive controls.
Archives of Pharmacal Research 05/2013; · 1.59 Impact Factor
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ABSTRACT: To explore the more active antitumor compounds, two series of new xanthones, containing 1,4-disubstituted-1,2,3-triazole moiety were designed and synthesized. Eaton's Reagent and "click reaction" were used in the synthesis. Most of the title compounds showed good inhibitory activity against the hepatoma carcinoma cell line (Bel-7402) and human cervical carcinoma cell line (HeLa) in vitro. Compounds 10a, 10e, 10f, 11r and 11t had potent activity with IC(50) values, ranging from 2.2 ± 0.17 to 7.1 ± 0.27 ∝M, which was equivalent to Doxorubicin.
Archives of Pharmacal Research 12/2012; 35(12):2093-104. · 1.59 Impact Factor
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ABSTRACT: A series of novel 1, 2, 4-triazole derivatives (9a-p) have been designed and synthesized as the potential antifungal agents. All compounds were characterized by (1)H-NMR, (13)C-NMR, and LCMS. Their antifungal activities against seven human pathogenic fungi were evaluated in vitro by measuring the minimal inhibitory concentrations. Most of the tested compounds were found to be more potent against Candida albicans than the control drug fluconazole.
Archives of Pharmacal Research 11/2012; 35(11):1895-901. · 1.59 Impact Factor
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ABSTRACT: In order to meet the urgent need for novel antifungal agents with improved activity and broader spectrum, a series of 3/4-[[N-alkyl-2-(2,4-difluorophenyl)-2-hydroxy-3-(1H-1, 2, 4-triazole)] propylamino] benzylethyl carbonate were designed, synthesized and evaluated as antifungal agents. The MIC80 values indicate that all the compounds showed only moderate or even no antifungal activities against nearly all the tested fungal pathogens. Moreover, the interactions of the most active compounds in the drug binding site of CACYP51 were also explored with the help of docking studies.
Medicinal chemistry (Shāriqah (United Arab Emirates)) 08/2012; · 1.64 Impact Factor
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ABSTRACT: In order to search for drugs with excellent anti-inflammatory activities, a series of novel sinomenine derivatives were designed, synthesized, and evaluated for their inhibition activities against NF-κB activation induced by lipopolysaccharide (LPS). Compared with the natural parent sinomenine, compounds 2a-w showed higher activity, while compounds 1a-o showed similar activity against NF-κB. Moreover, a molecular model for the binding between compound 2v and the active site of p50 was provided on the basis of the computational docking results.
Bioorganic & medicinal chemistry letters 08/2012; 22(18):5849-52. · 2.65 Impact Factor
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ABSTRACT: Diseases caused by systemic fungal infections have become a significant clinical problem in recent decades. A series of glycosyl derivatives of the approved cyclic peptide antifungal drug caspofungin conjugated with β-D-glucopyranose, β-D-galactopyranose, β-D-xylopyranose, β-L-rhamnopyranose, β-maltose and β-lactose units were designed, synthesized, and evaluated as new potential antifungal drugs. The compounds were obtained by coupling the corresponding glycosyl amines to the free primary amino groups of caspofungin through a bifunctional glutaryl linker. In contrast to caspofungin, these glycosylated derivatives are soluble in water, but are not hygroscopic and moreover, are more stable than caspofungin under high humidity and temperature. CD studies showed that glycosylation has very little impact on the conformation of the cyclic peptide of caspofungin. In vitro antifungal tests against seven human pathogenic fungi revealed that the caspofungin-monosaccharide conjugates, but not the disaccharide conjugates, have increased antifungal activities against the majority of tested fungus species relative to caspofungin. The β-D-glucopyranosyl derivative 2 a showed the strongest and broadest antifungal activity, providing a lead for further studies.
ChemMedChem 06/2012; 7(8):1496-503. · 3.15 Impact Factor
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ABSTRACT: A series of triazole antifungal agents with piperidine side chains were designed and synthesized. Results of preliminary antifungal tests against eight human pathogenic fungi in vitro showed that all the title compounds exhibited excellent activities with broad spectrum. Moreover, a molecular model for the binding between compound 12 and the active site of CACYP51 was provided based on the computational docking results. The side chain of the compound 12 is oriented into substrate access channel 2 (FG loop) and forms hydrophobic and van der waals interactions with surrounding hydrophobic residues. The phenyl group of the side chain can interact with the phenyl group of Phe380 through the formation of π-π face-to-edge interaction.
Chemical Biology & Drug Design 04/2012; 80(3):382-7. · 2.28 Impact Factor
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ABSTRACT: A series of 1-(1H-1,2,4-triazol-1-yl)-2-(2,4-difluorophenyl)-3-substituted-2-propanols (5a-5y) which are analogues of fluconazole, have been designed and synthesized via Cu(I)-catalyzed azide-alkyne cycloaddition on the basis of computational docking experiments to the active site of the cytochrome P450 14α-demethylase (CYP51). The in vitro antifungal activities of all the target compounds were evaluated against eight human pathogenic fungi. Compound 5l showed the best antifungal activities.
Bioorganic & medicinal chemistry letters 02/2012; 22(8):2959-62. · 2.65 Impact Factor
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ABSTRACT: A series of novel azoles (a-v), which are analogues of fluconazole, have been designed and synthesized as potential antifungal agents by the click reaction. The click reaction approach toward the synthesis of novel 1,2,3-triazolyl linked triazole antifungal derivatives a-v was achieved by Cu(I)-catalyzed 1,3-dipolar cycloaddition of propargylated intermediate 5 with substituted azidomethyl benzene. In addition, the target compounds tested can increase antifungal activity.
Archives of Pharmacal Research 10/2011; 34(10):1649-56. · 1.59 Impact Factor
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ABSTRACT: A series of novel 1,2,4-triazole derivatives with a 4-(4-substitutedphenyl) piperazine side chain were designed and synthesized based on the structure of lanosterol 14α-demethylase (CYP51). Their antifungal activities against eight human pathogenic fungi were evaluated in vitro by measuring the minimal inhibitory concentrations. Nearly all tested compounds were found to be more potent against Candida albicans than control drug fluconazole. Noticeably, the MIC(80) value of compounds 6,7,9,14 and 29 is 16 times lower than that of voriconazole against C. albicans. The activities of compounds 7 and 21 against Cryptococcus neoformans in vitro are comparable to that of voriconazole with a MIC(80) value of 0.0156 μg/mL. Moreover, the molecular model for the binding between compound 7 and the active site of CACYP51 was provided based on the computational docking results.
European journal of medicinal chemistry 02/2011; 46(7):3142-8. · 3.27 Impact Factor
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ABSTRACT: GM3, a sialylated trisaccharide antigen expressed by a number of tumors, is an attractive target in the design of therapeutic cancer vaccines. However, a serious problem associated with GM3 is that it is poorly immunogenic. To overcome this problem for the development of GM3-based cancer vaccines, four GM3 derivatives, including 5'-N-p-methylphenylacetyl, 5'-N-p-methoxyphenylacetyl, 5'-N-p-acetophenylacetyl and 5'-N-p-chlorophenylacetyl GM3, were synthesized and then coupled to a carrier protein, keyhole limpet haemocyanin (KLH). The resultant glycoconjugates were evaluated as vaccines in mouse and compared to the KLH conjugate of 5'-N-phenylacetyl GM3 (GM3NPhAc), a highly immunogenic GM3 derivative that was previously investigated as a vaccine candidate. All of the four new GM3 derivatives were proved to be more immunogenic than GM3NPhAc and elicit very strong T cell-dependent immune responses desirable for cancer immunotherapy. It was concluded that the new GM3 derivatives can form promising vaccine candidates that may be used to combine with cell glycoengineering for cancer immunotherapy.
Medicinal Chemistry Communication 01/2011; 2(6):524-530. · 2.80 Impact Factor
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ABSTRACT: A series of 1-(1H-1,2,4-triazol-1-yl)-2-(2,4-difluorophenyl)-3-substituted-2-propanols (1a-v, 2a-w), which are analogues of fluconazole, have been designed and synthesized as the potential antifungal agents by the click reaction. Click reaction approach toward the synthesis of two sets of novel 1,2,3-triazolyl linked triazole antifungal derivatives 1a-v, 2a-w was achieved by Cu(I)-catalyzed 1,3-dipolar cycloaddition of propargylated intermediate 8 with substituted azidomethyl benzene. The 1,2,3-triazolyl group was inserted into the side chain of the target molecule which can increase the antifungal activity of compounds.
European journal of medicinal chemistry 10/2010; 45(10):4435-45. · 3.27 Impact Factor
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ABSTRACT: Twenty-eight novel triazole derivatives (compounds 1a-v, 2a-f) have been synthesized for structure-activity relationship studies as antifungal agents. The compounds were designed on the basis of the structure of fluconazole and molecular modeling of the active site of the cytochrome P450 14α-demethylase (CYP51). All of them are reported for the first time. Their chemical structures are characterized by (1) H NMR, (13) C NMR, LC-MS, and elemental analysis. The antifungal activities have been evaluated in vitro by measuring the minimal inhibitory concentrations (MICs). Compounds 1a-v exhibited higher activity against nearly all fungi tested except Aspergillus fumigatus (A. fum) than fluconazole (FCZ). The computational molecular docking experiments indicated that the inhibition of CYP51 involves a coordination bond with iron of the heme group, a hydrophilic H-bonding region, a hydrophobic region, and a narrow hydrophobic binding cleft.
Chemical Biology & Drug Design 10/2010; 76(6):496-504. · 2.28 Impact Factor
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Honggang Hu,
Hongli Liao,
Jun Zhang,
Weifeng Wu,
Jufang Yan,
Yonghong Yan,
Qingjie Zhao,
Yan Zou,
Xiaoyun Chai, Shichong Yu,
Qiuye Wu
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ABSTRACT: Inhibitors of acyl-CoA:cholesterol acyltransferase (ACAT) would be useful anti-atherogenic agents, since an absence of ACAT affects the absorption and transformation of cholesterol, indirectly resulting in the reduction of cholesteryl ester accumulation in blood vessels. This report discloses xanthone sulfonamides as novel class small molecule inhibitors of ACAT. A series of xanthone sulfonamides were synthesized and evaluated to result in the identification of several potent ACAT inhibitors, among which 2n proved to be more potent than the positive control Sandoz58-35. Moreover, a molecular model for the binding between 2n and the active site of ACAT-2 was provided based computational docking results.
Bioorganic & medicinal chemistry letters 05/2010; 20(10):3094-7. · 2.65 Impact Factor
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ABSTRACT: Based on the results of computational docking to the active site of the cytochrome P450 14alpha-demethylase (CYP51), a series of 1-(1H-1,2,4-triazole-1-yl)-2-(2,4-difluorophenyl)-3-substituted benzylamino-2-propanols as analogs of fluconazole were designed, synthesized, and evaluated as antifungal agents. Results of preliminary antifungal tests against eight human pathogenic fungi in vitro showed that all the title compounds exhibited excellent activities with broad spectrum.
Bioorganic & medicinal chemistry letters 02/2009; 19(6):1811-4. · 2.65 Impact Factor
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ABSTRACT: Based on the results of computational docking to the active site of the cytochrome P450 14alpha-demethylase (CYP51), a series of 1-(1H-1,2,4-triazole-1-yl)-2-(2,4-difluorophenyl)-3-substituted-2-propanols as analogs of fluconazole were designed, synthesized, and evaluated as antifungal agents. The MIC(80) values indicate that compounds 1a-n exhibited higher activity against nearly all fungi tested except Aspergillus fumigatus than fluconazole, while compounds 2a-f, 3a-f showed no activity or only moderate activity against all fungi tested. Noticeably, the MIC value of compounds 1a, 1b and 1g is 64 times lower than that of fluconazole against Microsporum gypseum in vitro. And compounds 1a, 1b and 2b showed 128 times higher activity (with the MIC(80) value of 0.0039 microg/mL) than that of fluconazole against Candida albicans and also showed higher activity than that of the other positive controls. Computational docking experiments indicated that the inhibition of CYP51 involves a coordination bond with iron of the heme group, the hydrophilic H-bonding region, the hydrophobic region, and the narrow hydrophobic cleft. In addition, the activity of the compounds would be enhanced when the side chains were shorter.
European journal of medicinal chemistry 12/2008; 44(5):1913-20. · 3.27 Impact Factor
