Optimization of sulfonamide derivatives as highly selective EP1 receptor antagonists

A series of 4-[(2-{isobutyl[(5-methyl-2-furyl)sulfonyl]amino}phenoxy)methyl]benzoic acids and 4-({2-[isobutyl(1,3-thiazol-2-ylsulfonyl)amino]phenoxy}methyl)benzoic acids were synthesized and evaluated for their EP receptor affinities and EP1 receptor antagonist activities. Further structural optimization was carried out to reduce inhibitory activity against hepatic cytochrome P450 isozymes, which could represent a harmful potential drug interaction. Selected compounds were also evaluated for their binding affinities to hTP, hDP, mFP, and hIP, and for their hEP1 receptor antagonist activities. The results of structure–activity relationship studies are also presented.

Sulfonamide derivatives 13 and 15–17 were found to be highly potent and selective EP1 receptor antagonists. In vivo EP1 antagonist activity was also determined.Figure optionsDownload as PowerPoint slide