Article ; Online: Synthesis and Pharmacological Evaluation of 3-[(4-Oxo-4H-pyrido[3,2-e][1,3]thiazin-2-yl)(phenyl)amino]propanenitrile Derivatives as Orally Active AMPA Receptor Antagonists.
Chemical & pharmaceutical bulletin
2019 Volume 67, Issue 7, Page(s) 699–706
Abstract: In our search for novel orally active α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor antagonists, we found that conversion of an allyl group in the lead compound 2-[allyl(4-methylphenyl)amino]-4H-pyrido[3,2-e][1,3]thiazin-4-one (4) ... ...
| Abstract | In our search for novel orally active α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor antagonists, we found that conversion of an allyl group in the lead compound 2-[allyl(4-methylphenyl)amino]-4H-pyrido[3,2-e][1,3]thiazin-4-one (4) to a 2-cyanoethyl group significantly increased inhibitory activity against AMPA receptor-mediated kainate-induced toxicity in rat hippocampal cultures. Here, we synthesized 10 analogs bearing a 2-cyanoethyl group and administered them to mice to evaluate their anticonvulsant activity in maximal electroshock (MES)- and pentylenetetrazol (PTZ)-induced seizure tests, and their effects on motor coordination in a rotarod test. 3-{(4-Oxo-4H-pyrido[3,2-e][1,3]thiazin-2-yl)[4-(trifluoromethoxy)phenyl]amino}propanenitrile (25) and 3-[(2,2-difluoro-2H-1,3-benzodioxol-5-yl)(4-oxo-4H-pyrido[3,2-e][1,3]thiazin-2-yl)amino]propanenitrile (27) exhibited potent anticonvulsant activity in both seizure tests and induced minor motor disturbances as indicated in the rotarod test. The protective index values of 25 and 27 for MES-induced seizures (10.7 and 12.0, respectively) and PTZ-induced seizures (6.0 and 5.6, respectively) were considerably higher compared with those of YM928 (5) and talampanel (1). |
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| MeSH term(s) | Administration, Oral ; Animals ; Anticonvulsants/chemical synthesis ; Anticonvulsants/pharmacology ; Anticonvulsants/therapeutic use ; Hippocampus/cytology ; Hippocampus/drug effects ; Hippocampus/metabolism ; Locomotion/drug effects ; Male ; Mice ; Mice, Inbred ICR ; Microsomes, Liver/metabolism ; Nitriles/chemistry ; Nitriles/pharmacology ; Nitriles/therapeutic use ; Pentylenetetrazole/toxicity ; Rats ; Rats, Wistar ; Receptors, AMPA/antagonists & inhibitors ; Receptors, AMPA/metabolism ; Seizures/chemically induced ; Seizures/drug therapy ; Seizures/veterinary ; Structure-Activity Relationship |
| Chemical Substances | Anticonvulsants ; Nitriles ; Receptors, AMPA ; Pentylenetetrazole (WM5Z385K7T) |
| Language | English |
| Publishing date | 2019-05-07 |
| Publishing country | Japan |
| Document type | Journal Article |
| ZDB-ID | 213307-6 |
| ISSN | 1347-5223 ; 0009-2363 |
| ISSN (online) | 1347-5223 |
| ISSN | 0009-2363 |
| DOI | 10.1248/cpb.c18-00977 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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