title: Synthesis and biological evaluation of 1,3-diphenylprop-2-en-1-ones possessing a methanesulfonamido or an azido pharmacophore as cyclooxygenase-1/-2 inhibitors.
abstract: A group of (E)-1,3-diphenylprop-2-en-1-one derivatives (chalcones) possessing a MeSO(2)NH, or N(3), COX-2 pharmacophore at the para-position of the C-1 phenyl ring were synthesized using a facile stereoselective Claisen-Schmidt condensation reaction. In vitro COX-1/COX-2 structure-activity relationships were determined by varying the substituents on the C-3 phenyl ring (4-H, 4-Me, 4-F, and 4-OMe). Among the 1,3-diphenylprop-2-en-1-ones possessing a C-1 para-MeSO(2)NH COX-2 pharmacophore, (E)-1-(4-methanesulfonamidophenyl)-3-(4-methylphenyl)prop-2-en-1-one (7b) was identified as a selective COX-2 inhibitor (COX-2 IC(50)=1.0 microM; selectivity index >100) that was less potent than the reference drug rofecoxib (COX-2 IC(50)=0.50 microM; SI>200). The corresponding 1,3-diphenylprop-2-en-1-one analogue possessing a C-1 para-N(3) COX-2 pharmacophore, (E)-1-(4-azidophenyl)-3-(4-methylphenyl)prop-2-en-1-one (7f), exhibited potent and selective COX-2 inhibition (COX-1 IC(50)=22.2 microM; COX-2 IC(50)=0.3 microM; SI=60). A molecular modeling study where 7b and 7f were docked in the binding site of COX-2 showed that the p-MeSO(2)NH and N(3) substituents on the C-1 phenyl ring are oriented in the vicinity of the COX-2 secondary pocket (His90, Arg513, Phe518, and Val523). The structure-activity data acquired indicate that the propenone moiety constitutes a suitable scaffold to design new acyclic 1,3-diphenylprop-2-en-1-ones with selective COX-1 or COX-2 inhibitory activity.
authors.affiliation: Department of Pharmaceutical Chemistry and Toxicology, School of Pharmacy, Shaheed Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Afshin
authors.initials: A
authors.lastname: Zarghi
authors.forename: Tannaz
authors.initials: T
authors.lastname: Zebardast
authors.forename: Farinaz
authors.initials: F
authors.lastname: Hakimion
authors.forename: Farshad H
authors.initials: FH
authors.lastname: Shirazi
authors.forename: P N Praveen
authors.initials: PN
authors.lastname: Rao
authors.forename: Edward E
authors.initials: EE
authors.lastname: Knaus
mesh_terms: D000818:Animals; D001386:Azides / Q000737:chemistry*; D001665:Binding Sites; D047188:Chalcones / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D051545:Cyclooxygenase 1 / Q000187:drug effects*; D051546:Cyclooxygenase 2 / Q000187:drug effects*; D016861:Cyclooxygenase Inhibitors / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D004353:Drug Evaluation, Preclinical; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008958:Models, Molecular; D015394:Molecular Structure; D012680:Sensitivity and Specificity; D012756:Sheep; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013449:Sulfonamides / Q000737:chemistry*
chemical_list: D001386:Azides; D047188:Chalcones; D016861:Cyclooxygenase Inhibitors; D013449:Sulfonamides; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2