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.
A focus on the asymmetric synthesis of a novel threo-β-benzyl-β-hydroxy aspartate analogue
摘要:
Considering the biological activity of beta-alkyl-beta-hydroxyaspartate derivatives as potent blockers of glutamate transporters (EAATs) impacting on glutamatergic synapses activity, we have developed a concise, asymmetric synthesis of enantiomerically pure threo-beta-benzyl-beta-hydroxyaspartates. The key step is a regiospecific and stereoselective Sharpless asymmetric aminohydroxylation (SAA) on previously synthesized benzyl fumarate. (C) 2012 Elsevier Ltd. All rights reserved.
(2R, 3S)- and (2S, 3R)-2-Benzyl-3,4-epoxybutanoic acid as highly efficient and fast acting pseudomechanism-based inactivators for carboxypeptidase a: design, asymmetric synthesis and inhibitory kinetics
作者:Soo Suk Lee、Zhi-Hong Li、Dong Ha Lee、Dong H. Kim
DOI:10.1039/p19950002877
日期:——
2-Benzyl-3,4-epoxybutanoic acid (BEBA) was studied as an irreversible inhibitor for the zinc-containing protease, carboxypeptidase A. Of four possible stereoisomers, those having a 2R,3S- and a 2S,3R-configuration inhibited carboxypeptidase A in a time dependent manner. The latter compound that belongs to the D series is more effective with a k(inact)/K-i value of 139.5 dm(3) mol(-1) s(-1) than the former having a K-inact/K-i value of 53.9 dm(3) mol(-1) s(-1). Partition ratios, fore (2R,3S)- and (2S,3R)-BEBA were determined as 1.01 and 0.53, respectively. The observed kinetic parameters reveal that both are highly efficient and fast acting pseudomechanism-based inactivators for carboxypeptidase A. Details of the kinetic analyses, design principles and asymmetric syntheses of these inactivators are described.
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.
A focus on the asymmetric synthesis of a novel threo-β-benzyl-β-hydroxy aspartate analogue
Considering the biological activity of beta-alkyl-beta-hydroxyaspartate derivatives as potent blockers of glutamate transporters (EAATs) impacting on glutamatergic synapses activity, we have developed a concise, asymmetric synthesis of enantiomerically pure threo-beta-benzyl-beta-hydroxyaspartates. The key step is a regiospecific and stereoselective Sharpless asymmetric aminohydroxylation (SAA) on previously synthesized benzyl fumarate. (C) 2012 Elsevier Ltd. All rights reserved.