title: Synthesis and biological evaluation of methanesulfonamide analogues of rofecoxib: Replacement of methanesulfonyl by methanesulfonamido decreases cyclooxygenase-2 selectivity.
abstract: A new group of 3-(4-substituted-phenyl)-4-(4-methylsulfonamidophenyl)-2(5H)furanones in which the methylsulfonyl (MeSO(2)) COX-2 pharmacophore present in rofecoxib was replaced by a methanesulfonamido (MeSO(2)NH) moiety, and where the substituent at the para-position of the C-3 phenyl ring was simultaneously varied (H, F, Cl, Br, Me, OMe), were evaluated to determine the combined effects of steric and electronic substituent properties upon COX-1 and COX-2 inhibitory potency and COX isozyme selectivity. Structure-activity relationship (SAR) studies showed that compounds having a neutral (H), or electronegative halogen (F, Cl, Br), substituent at the para-position of the C-3 phenyl ring inhibited both COX-1 and COX-2 with COX-2 selectivity indexes in the 3.1-39.4 range. In contrast, compounds having an electron-donating Me or OMe substituent were selective inhibitors of COX-2 (COX-1 IC(50)>100 microM). These SAR data indicate the 3-aryl-4-(4-methylsulfonamidophenyl)-2(5H)furanone scaffold provides a suitable template to design COX inhibitors with variable COX-2 selectivity indexes.
authors.affiliation: Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta Edmonton, Alta., Canada.
authors.forename: Afshin
authors.initials: A
authors.lastname: Zarghi
authors.forename: P N
authors.initials: PN
authors.lastname: Praveen Rao
authors.forename: Edward E
authors.initials: EE
authors.lastname: Knaus
mesh_terms: D051545:Cyclooxygenase 1 / Q000378:metabolism; D052246:Cyclooxygenase 2 Inhibitors / Q000138:chemical synthesis* / Q000494:pharmacology*; D016861:Cyclooxygenase Inhibitors / Q000138:chemical synthesis / Q000494:pharmacology; D007202:Indicators and Reagents; D007783:Lactones / Q000138:chemical synthesis* / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D013055:Spectrophotometry, Infrared; D017550:Spectroscopy, Fourier Transform Infrared; D013329:Structure-Activity Relationship; D013449:Sulfonamides / Q000138:chemical synthesis / Q000494:pharmacology; D013450:Sulfones / Q000138:chemical synthesis* / Q000494:pharmacology*
chemical_list: D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D007202:Indicators and Reagents; D007783:Lactones; D013449:Sulfonamides; D013450:Sulfones; C116926:rofecoxib; D051545:Cyclooxygenase 1