Stereospecific High-affinity TRPV1 Antagonists: Chiral <i>N</i>-(2-Benzyl-3-pivaloyloxypropyl) 2-[4-(methylsulfonylamino)phenyl]propionamide Analogues
作者:HyungChul Ryu、Mi-Kyoung Jin、Su Yeon Kim、Hyun-Kyung Choi、Sang-Uk Kang、Dong Wook Kang、Jeewoo Lee、Larry V. Pearce、Vladimir A. Pavlyukovets、Matthew A. Morgan、Richard Tran、Attila Toth、Daniel J. Lundberg、Peter M. Blumberg
DOI:10.1021/jm701049p
日期:2008.1.1
Previously, we reported the thiourea antagonists 2a and 2b as potent and high affinity TRPV1 antagonists. For further optimization of the lead compounds, a series of their amide and alpha-substituted amide surrogates were investigated and novel chiral N-(2-benzyl-3-pivaloyloxypropyl) 2-[4-(methylsulfonylamino)phenyl]propionamide analogues were characterized as potent and stereospecific rTRPV1 antagonists. In particular, compounds 72 and 73 displayed high binding affinities, with K-i values of 4.12 and 1.83 nM and potent antagonism with Ki values of 0.58 and 5.2 nM, respectively, in rTRPV1/CHO cells. These values are comparable or more potent than those of 5-iodoRTX under the same assay conditions. A distinctive binding model that includes two hydrophobic pockets is proposed for this series of compounds based on docking studies of 57 and 72 with a homology model of the TM3/4 region of TRPV1.