Abstract
Structural optimization of multiple H-bonding region and structure–activity relationship of diarylalkyl amides/thioamides as novel TRPV1 antagonists are described. In particular, we identified amide 34o and thioamides 35o and 35r, of which antagonistic activities were highly enhanced by an incorporation of cyano or vinyl-substituent to the multiple H-bonding region. They exhibited potent 45Ca 2+ uptake inhibitions in rat DRG neuron with IC 50s of 25, 32 and 28 nM, respectively.
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