Synthesis and Biological Evaluation of 2-Phenylpyran-4-ones: A New Class of Orally Active Cyclooxygenase-2 Inhibitors
摘要:
A series of 2-phenylpyran-4-ones were prepared and evaluated for their ability to inhibit cyclooxygenase-2 (COX-2). Extensive structure-activity relationship work was carried out within this series, and a number of potent and selective COX-2 inhibitors were identified. Compounds having a p-methylsulfone group at the 2-phenyl ring showed the best COX-2 inhibitory activity. The introduction of a substituted phenoxy ring at position 3 enhanced both the in vitro and in vivo activity within the series. A selected group of 3-phenoxypyran-4-ones exhibited excellent activity in an experimental model of pyresis. The in vivo antiinflammatory activity of these compounds was confirmed with the evaluation of their antiarthritic and analgesic effectiveness. Moreover, their pharmacokinetic profile in rats is compatible with a once a day administration by oral route in humans. Within this novel series, compounds 21, 31, 34, and 35 have been selected for further preclinical. and clinical evaluation.
Synthesis, docking simulation, biological evaluations and 3D-QSAR study of 5-Aryl-6-(4-methylsulfonyl)-3-(metylthio)-1,2,4-triazine as selective cyclooxygenase-2 inhibitors
hence could be considered as a promising lead candidate for further drug development. Furthermore, the affinity data of these compounds were rationalized through enzyme docking simulation and 3D-QSAR study by k-Nearest Neighbour Molecular Field Analysis.
Synthesis and SAR of a New Series of COX-2-Selective Inhibitors: Pyrazolo[1,5-<i>a</i>]pyrimidines
作者:Carmen Almansa、Alberto F. de Arriba、Fernando L. Cavalcanti、Luis A. Gómez、Agustí Miralles、Manuel Merlos、Julián García-Rafanell、Javier Forn
DOI:10.1021/jm0009383
日期:2001.2.1
The synthesis and pharmacological activity of a series of bicyclic pyrazolo[1,5-a]pyrimidines as potent and selective cyclooxygenase-2 (COX-2) inhibitors are described. The new compounds were evaluated both in vitro (COX-1 and COX-2 inhibition in human whole blood) and in vive (carrageenan-induced paw edema and air-pouch model). Modification of the pyrimidine substituents showed that 6,7-disubstitution provided the best activity and led to the identification of 3-(4-fluorophenyl)-6,7-dimethyl-2-(4-methylsulfonylphenyl)pyrazolo[1,5-a]pyrimidine (10f) as one of the most potent and selective COX-2 inhibitor in this series.
Synthesis and Biological Evaluation of 2-Phenylpyran-4-ones: A New Class of Orally Active Cyclooxygenase-2 Inhibitors
A series of 2-phenylpyran-4-ones were prepared and evaluated for their ability to inhibit cyclooxygenase-2 (COX-2). Extensive structure-activity relationship work was carried out within this series, and a number of potent and selective COX-2 inhibitors were identified. Compounds having a p-methylsulfone group at the 2-phenyl ring showed the best COX-2 inhibitory activity. The introduction of a substituted phenoxy ring at position 3 enhanced both the in vitro and in vivo activity within the series. A selected group of 3-phenoxypyran-4-ones exhibited excellent activity in an experimental model of pyresis. The in vivo antiinflammatory activity of these compounds was confirmed with the evaluation of their antiarthritic and analgesic effectiveness. Moreover, their pharmacokinetic profile in rats is compatible with a once a day administration by oral route in humans. Within this novel series, compounds 21, 31, 34, and 35 have been selected for further preclinical. and clinical evaluation.
Synthesis and biological evaluation of 2,3-diarylpyrazines and quinoxalines as selective COX-2 inhibitors
作者:Sunil K. Singh、V. Saibaba、V. Ravikumar、Santosh V. Rudrawar、Pankaj Daga、C.Seshagiri Rao、V. Akhila、P. Hegde、Y.Koteswar Rao
DOI:10.1016/j.bmc.2004.01.033
日期:2004.4
Several 2,3-diaryl pyrazines and quinoxalines with 4-sulfamoyl (SO2NH2)/methylsulfonyl (SO2Me)-phenyl pharmaco-phores have been synthesized and evaluated for the cyclooxygenase (COX-1/COX-2) inhibitory activity. Smaller groups such as methoxy, methyl and fluoro when substituted at/around position-4 of the adjacent phenyl ring, have great impact on the selective COX-2 inhibitory activity of the series. Many potential compounds were obtained from a brief structure-activity relationship (SAR) study. Two of these, compounds 11 and 25 exhibited excellent in vivo activity in the established animal model of inflammation. Since compound 25 possessed an amenable sulfonamide group, two of its prodrugs 48 and 49 were also synthesized. Both of them have excellent in vivo potential, and represent a new class of COX-2 inhibitor. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis and antiseizure activity of (E)-1,2-diarylethylidenehydrazine carboximidamides against tonic-clonic seizures: an intracerebroventricular and electrophysiological study
A series of (E)-1,2-diarylethylidenehydrazine carboximidamides2a-jwere synthesized and characterized by NOESY experiment as anticonvulsant agents and their antiseizure activity was evaluated by intracerebroventricular administration of compounds. Most of the compounds had significant protection against tonic-clonic seizures and2awas found to be as equipotent as carbamazepine in seizures control. In order to find their anticonvulsant mechanism of action,2awas subjected to further electrophysiological studies using patch-clamp technique. The results confirmed that this compound is neither a voltage-gated sodium channel blocker nor a NMDA/AMPA antagonist. Although2adid not show any direct GABA agonistic activity, it could decrease EPSP and increase IPSP frequency without any change in amplitude. Finally, the results indicated most likely a presynaptic GABA-mediated mechanism of2afor its antiseizure activity such as inhibition of the GABA-T which was validated by molecular docking.