Dibenzoxepinone Hydroxylamines and Hydroxamic Acids:  Dual Inhibitors of Cyclooxygenase and 5-Lipoxygenase with Potent Topical Antiinflammatory Activity

Hydroxylamine and hydroxamic acid derivatives of a known nonsteroidal antiinflammatory dibenzoxepine series display both cyclooxygenase (CO) and 5-lipoxygenase (5-LO) inhibitory properties. Many of these new dual CO/5-LO inhibitors also exhibit potent topical antiinflammatory activity in the arachidonic acid-induced murine ear edema model. On the basis of their promising profile of in vitro and in vivo activities, hydroxamic acids 24h, 3-(6,11-dihydro-11-oxodibenz[b,e]oxepin-2-yl)-N-hydroxy-N-methylpropanamide (HP 977), and 25, 3-(6,11-dihydrodibenz[b,e]oxepin-2-yl)-N-hydroxy-N-methylpropanamide (P10294), were selected as developmental candidates for the topical treatment of inflammatory skin disorders.