1,2-Diarylcyclopentenes as Selective Cyclooxygenase-2 Inhibitors and Orally Active Anti-inflammatory Agents

James J. Li, Gary D. Anderson, Earl G. Burton, J. Nita Cogburn, Joe T. Collins, Danny J. Garland, Susan A. Gregory, Horng Chih Huang, Peter C. Isakson, Carol M. Koboldt, Eugene W. Logusch, Monica B. Norton, William E. Perkins, Emily J. Reinhard, Karen Seibert, Amy W. Veenhuizen, Yan Zhang, David B. Reitz

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205 Scopus citations

Abstract

A series of 1,2-diarylcyclopentene methyl sulfones and sulfonamides have been shown to be remarkably potent and selective cyclooxygenase-2 (COX-2) inhibitors. The methyl sulfone analogs 7 showed excellent COX-2 activity, with IC50s ranging from 0.003 (7f,n) to 0.87 (7o) μM. In addition, most analogs of 7 showed no activity (IC50 > 100 μM) against the COX-1 enzyme. Replacement of the methyl sulfone moiety with a sulfonamide group gave a slightly more potent (typically 2-5-fold) but less selective COX-2 inhibitor, mainly due to an increase (20-> 100-fold) in COX-1 activity. However, in vitro COX-1/COX-2 selectivity for the sulfonamides 8 could be increased in many cases by simply incorporating a substituent at the 3-position of the phenyl group. Furthermore, in vitro selectivity increased with the size and number of substituents, as demonstrated in the selectivity trend of 8k (8000) > 8j (1900) > 8i (500) > 8h (100). More importantly, the sulfonamide COX-2 inhibitors showed greatly enhanced oral activity in the rat model of established adjuvant-induced arthritis, with inhibition values of 79.0% (8a), 81.5% (8c), and 83.0% (8g) at 1 mg/kg. On the basis of its overall biological profile, sulfonamide 8c was evaluated as a potential clinical candidate, displaying an ED50 of 22 mpk in the rat carrageenan-induced paw edema model and an ED50 of 0.16 mpk in the rat established adjuvant-induced arthritis model with no indication of gastrointestinal toxicity in rats and mice at 200 mpk. In addition, a preparative-scale synthetic route to sulfonamide 8c has been developed.

Original languageEnglish
Pages (from-to)4570-4578
Number of pages9
JournalJournal of Medicinal Chemistry
Volume38
Issue number22
DOIs
StatePublished - Oct 1 1995

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