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Medicinal Chemistry
ISSN (Print): 1573-4064
ISSN (Online): 1875-6638
Epub Full Text Article
DOI: 10.2174/1573406410666140428104444      Price:  $95









Syntheses and N-methyl-D-aspartate Receptor Antagonist Pharmacology of Fluorinated Arylcycloheptylamines

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Author(s): Shengguo Sun, Jason Wallach and Adeboye Adejare
Abstract:
Selective uncompetitive antagonists of the phencyclidine (PCP) binding site of the N-methyl-D-aspartate receptor (NMDAR) are known to have therapeutic potential as anticonvulsants and neuroprotective agents. Several fluorinated molecules with each containing a cycloheptane ring were designed to probe the PCP pharmacophore and test the influence of fluorine substitution on NMDAR binding and in vivo efficacy. Syntheses and analyses of six novel compounds, 1-(4-fluorophenyl)cycloheptanamine (3), 1-(1-(4-fluorophenyl)cycloheptyl)piperidine (4), 1-(1-(4-fluorophenyl)cycloheptyl)pyrrolidine (5), 1-(3-fluorophenyl)cycloheptanamine (6), 1-(1-(3-fluorophenyl)cycloheptyl)piperidine (7), 1-(1-(3-fluorophenyl)cycloheptyl)pyrrolidine (8) and several related reference arylcyloalkylamines are described. Receptor binding was performed at the PCP site of NMDAR for each compound using [3H]-(+)-MK-801 displacement. Unexpectedly, the 3-fluoro- primary amine 6 had the greatest affinity of the series and these binding results support a different structure activity relationship (SAR) profile for arylcycloheptylamines when compared to arylcyclohexylamines like PCP. Five of the novel compounds have affinity (Ki) in the hundred nM (10-7) range. In addition, compounds 3, 5, 6, 7 and 8 were evaluated and found to exhibit neuroprotective effects from NMDA induced toxicity in vitro and compounds 6, 7 and 8 exhibited anticonvulsant activities in rats. An ED50 of 13.84 mg/kg was found for compound 6 in rat MES test with a protective index (PI) of 3.66 against ataxia. These results support further investigation of the arylcycloheptylamine class
Keywords:
Arylcycloheptylamines, Arylcyclohexylamines, Fluorinated PCP Analogs, N-methyl-D-aspartate receptor, Phencyclidine, NMDAR Antagonists
Affiliation:
Department of Pharmaceutical Sciences, Philadelphia College of Pharmacy, University of the Sciences in Philadelphia, Philadelphia, PA 19104, USA