2-(4-Methylsulfonylaminophenyl) propanamide TRPV1 antagonists: Structure–activity relationships in the B and C-regions

On the basis of the previous lead N-4-t-butylbenzyl 2-(3-fluoro-4-methylsulfonylaminophenyl) propanamide (3) as a potent TRPV1 antagonist, structure–activity relationships for the B (propanamide part) and C-region (4-t-butylbenzyl part) have been investigated for rTRPV1 in CHO cells. The B-region was modified with dimethyl, cyclopropyl and reverse amides and then the C-region was replaced with 4-substituted phenyl, aryl alkyl and diaryl alkyl derivatives. Among them, compound 50 showed high binding affinity with Ki = 21.5 nM, which was twofold more potent than 3 and compound 54 exhibited potent antagonism with Ki(ant) = 8.0 nM comparable to 3.

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