A rational approach to the design of flavones as xanthine oxidase inhibitors
摘要:
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.
Synthesis, biopharmaceutical characterization, antimicrobial and antioxidant activities of 1-(4′-O-β-d-glucopyranosyloxy-2′-hydroxyphenyl)-3-aryl-propane-1,3-diones
摘要:
This research communication is toward the investigation of the antibacterial, antifungal and antioxidant activities of the synthesized compounds 1-(4'-O-beta-D-glucopyranosyloxy-2'-hydroxyphenyl)-3-aryl-propane-1,3-diones (5a)-(5h). These compounds have been obtained by the interaction of alpha-acetobromoglucose with 1-(2',4'-dihydroxyphenyl)-3-aryl-propane-1,3-diones (3a)-(3h) under anhydrous condition and at lower temperature. The structures of these newly synthesized O-beta-D-glucopyranosides were established on the basis of chemical, elemental, and spectral analyses. Further, the compounds (5b), (5c), (5d) and (5g) showed potent antibacterial and antifungal activity. A good correlation was obtained between the theoretical predictions of bioavailability using Lipinski's rule-of-five and experimental verification. (c) 2011 Elsevier Masson SAS. 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.
Synthesis, biopharmaceutical characterization, antimicrobial and antioxidant activities of 1-(4′-O-β-d-glucopyranosyloxy-2′-hydroxyphenyl)-3-aryl-propane-1,3-diones
作者:Javed Sheikh、Ali Parvez、Harjeet Juneja、Vishwas Ingle、Zahid Chohan、Moulay Youssoufi、Taibi Ben Hadda
DOI:10.1016/j.ejmech.2011.01.068
日期:2011.4
This research communication is toward the investigation of the antibacterial, antifungal and antioxidant activities of the synthesized compounds 1-(4'-O-beta-D-glucopyranosyloxy-2'-hydroxyphenyl)-3-aryl-propane-1,3-diones (5a)-(5h). These compounds have been obtained by the interaction of alpha-acetobromoglucose with 1-(2',4'-dihydroxyphenyl)-3-aryl-propane-1,3-diones (3a)-(3h) under anhydrous condition and at lower temperature. The structures of these newly synthesized O-beta-D-glucopyranosides were established on the basis of chemical, elemental, and spectral analyses. Further, the compounds (5b), (5c), (5d) and (5g) showed potent antibacterial and antifungal activity. A good correlation was obtained between the theoretical predictions of bioavailability using Lipinski's rule-of-five and experimental verification. (c) 2011 Elsevier Masson SAS. All rights reserved.