title: Synthesis and biological evaluation of 2,3-diarylpyrazines and quinoxalines as selective COX-2 inhibitors.
abstract: Several 2,3-diaryl pyrazines and quinoxalines with 4-sulfamoyl (SO(2)NH(2))/methylsulfonyl (SO(2)Me)-phenyl pharmacophores 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.
authors.affiliation: Discovery Chemistry, Bollaram Road, Miyapur, Hyderabad 500 049, India. sunilkumarsingh@drreddys.com
authors.forename: Sunil K
authors.initials: SK
authors.lastname: Singh
authors.forename: V
authors.initials: V
authors.lastname: Saibaba
authors.forename: V
authors.initials: V
authors.lastname: Ravikumar
authors.forename: Santosh V
authors.initials: SV
authors.lastname: Rudrawar
authors.forename: Pankaj
authors.initials: P
authors.lastname: Daga
authors.forename: C Seshagiri
authors.initials: CS
authors.lastname: Rao
authors.forename: V
authors.initials: V
authors.lastname: Akhila
authors.forename: P
authors.initials: P
authors.lastname: Hegde
authors.forename: Y Koteswar
authors.initials: YK
authors.lastname: Rao
mesh_terms: D000818:Animals; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000138:chemical synthesis* / Q000494:pharmacology / Q000627:therapeutic use; D004353:Drug Evaluation, Preclinical / Q000379:methods; D004487:Edema / Q000188:drug therapy / Q000201:enzymology; D007527:Isoenzymes / Q000037:antagonists & inhibitors* / Q000378:metabolism; D008297:Male; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism; D011719:Pyrazines / Q000138:chemical synthesis* / Q000494:pharmacology / Q000627:therapeutic use; D011810:Quinoxalines / Q000138:chemical synthesis* / Q000494:pharmacology / Q000627:therapeutic use; D051381:Rats; D017208:Rats, Wistar
chemical_list: D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D007527:Isoenzymes; D011719:Pyrazines; D011810:Quinoxalines; D051546:Cyclooxygenase 2; D011451:Prostaglandin-Endoperoxide Synthases