Design, Synthesis, and Biological Evaluation of 3-Benzazepin-1-ols as NR2B-Selective NMDA Receptor Antagonists
摘要:
AbstractCleavage and reconstitution of a bond in the piperidine ring of ifenprodil (1) leads to 7‐methoxy‐2,3,4,5‐tetrahydro‐1H‐3‐benzazepin‐1‐ols, a novel class of NR2B‐selective NMDA receptor antagonists. The secondary amine 7‐methoxy‐2,3,4,5‐tetrahydro‐1H‐3‐benzazepin‐1‐ol (12), which was synthesized in six steps starting from 2‐phenylethylamine 3, represents the central building block for the introduction of several N‐linked residues. A distance of four methylene units between the basic nitrogen atom and the phenyl residue in the side chain results in high NR2B affinity. The 4‐phenylbutyl derivative 13 (WMS‐1405, Ki=5.4 nM) and the conformationally restricted 4‐phenylcyclohexyl derivative 31 (Ki=10 nM) represent the most potent NR2B ligands of this series. Whereas 13 shows excellent selectivity, the 4‐phenylcyclohexyl derivative 31 also interacts with σ1 (Ki=33 nM) and σ2 receptors (Ki=82 nM). In the excitotoxicity assay the phenylbutyl derivative 13 inhibits the glutamate‐induced cytotoxicity with an IC50 value of 360 nM, indicating that 13 is an NMDA antagonist.
Butyrophenones as hypotensive agents. Derivatives of 4-aryl-4-(hydroxymethyl)cyclohexylamine
作者:Daniel Lednicer、D. Edward Emmert、Alan D. Rudzik、Boyd E. Graham
DOI:10.1021/jm00240a014
日期:1975.6
preparation of butyrophenone derivatives of 4-aryl-4-(hydroxymethyl)cyclohex-1-ylamines starting from the corresponding 4-cyano-4-phenylcyclohexan-1-ones is described. Substitution was varied with both rings; both isomers of 4-phenyl-4-(hydroxymethyl)cyclohex-1-ylamine were characterized. Those derivatives which carried p-fluoro substitution on the butyrophenone exhibited hypotensive activity in the rat with
NR2B selective NMDA receptor antagonists with tetrahydro-3-benzazepine-1,7-diol scaffold have been designed by formal cleavage and reconstitution of the piperidine ring of the lead compound ifenprodil (1). The secondary amine 10 represents the central building block for the synthesis of more than 25 tetrahydro-3-benzazepin-1-ols. Generally 7-hydroxy derivatives display higher NR2B receptor affinities than the corresponding 7-benzyloxy compounds. A distance of four atoms (five bond lengths) between the basic amino group and the terminal aryl moiety led to highest NR2B affinity. 3-(4-Phenylbutyl)-2,3,4,5- tetrahydro-1H-3-benzazepine-1,7-diol (WMS-1410, 25) represents the most promising NR2B antagonist of this series showing a K-i-value of 14 nM. Compound 25 reveals excellent selectivity over more than 100 further relevant target proteins, antagonizes glutamate induced excitotoxicity (IC50 = 18.4 nM) and is metabolically more stable than ifenprodil. Up to a dose of 100 mg/kg 25 is well tolerated by mice and it shows dose dependent analgesic activity in the late neuropathic pain phase of the formalin assay. (C) 2010 Elsevier Ltd. All rights reserved.
PROST M.; CROMPHAUT V. VAN; VERSTRAETEN W.; DIRKS M.; TORNAY C.; COLOT M.+, EUR. J. MED. CHEM.-CHIM. THER., 1980, 15, NO 3, 215-222