N-(5-substituted) thiophene-2-alkylsulfonamides as potent inhibitors of 5-lipoxygenase

Abstract Compound 4k N -[5-(4-fluoro)phenoxythien-2-yl]methanesulfonamide is representative of a new class of potent inhibitors of 5-lipoxygenase (5-LO). These versatile compounds exhibit dose-dependent inhibition of 5-LO with IC 50 s ranging from 20–100 nM in the rat basophilic leukemia (RBL-1) cell homogenate assay and submicromolar IC 50 s in both the RBL-1 and human peripheral blood leukocyte (PBL) whole cell assays. Compound 4k also showed significant anti-inflammatory activity in the adjuvant arthritic rat at an oral dose of 3 mg/kg.