Synthesis of the butanamide derivative S 19812, a new dual inhibitor of cyclooxygenase and lipoxygenase pathways.

The general synthetic pathway and the interactions with arachidonic acid metabolism of the new compound S 19812 (N-hydroxy-N-methyl 4-(2,3-bis-(4-methoxyphenyl)-thiophen-5-yl)butanamide, CAS 181308-68-9) were investigated. S 19812 was selected for its well balanced dual inhibition of cyclooxygenase and 5-lipoxygenase pathways in vitro in rat polymorphonuclear neutrophils (PMNs) (IC50 PGE2: 0.10 mumol/l, LTB4: 0.

Amino derivatives of phenyl alkyl thiophene as inhibitors of bone resorption. Structure-activity relationship.

Metabolism of arachidonic acid through the 5-lipoxygenase (LO) pathway generates compounds that stimulate osteoclastic bone resorption; since LO metabolites might play a role in bone loss due to excessive resorption it was tried to develop a series of antiresorptive agents starting from an already known LO inhibitor. Of the 35 compounds synthesized, 11 strongly inhibited (10 mumol/l) retinoic acid-induced bone resorption in cultured mouse calvariae; they were also tested for their effect on LO activity using rat peritoneal neutrophils, but no correlation could be drawn between inhibition of LO and bone resorption. Other pathways, still to be identified, must therefore be targeted by these compounds even though LO inhibition might contribute to their effects on bone.