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- W2089413283 abstract "The synthesis of new H3-receptor antagonists, 4-(2-heteroarylaminoethyl) and 4-(2-heteroarylthioethyl) imidazoles and their H3-receptor affinity obtained from competitive binding curves vs [3H]-Nα-methylhistamine ([3H]NAMHA) on rat brain cortex membranes are described. These compounds are derived from structural modulations of thioperamide and were synthesized in order to study binding interactions with H3-receptors and find alternative lead compounds with H3-receptor antagonist activity. The new compounds differ from thioperamide by the following features: 1) the N-cyclohexylcarbothioamide moiety of thioperamide has been replaced by a benzothiazole (1); 2) the piperidine ring has been replaced by more flexible aminoethyl and thioethyl chains, in order to lower the excessive rigidity of 1 and to test the importance of the tertiary piperidine nitrogen; and 3) the benzothiazole moiety of 1 has been replaced by other heterocyclic nuclei, endowed with different lipophilic, steric and hydrogen-bonding features. Some of the compounds tested showed good affinity for central H3-receptors (pKi range: 5.89–7.96) and can be considered as lead compounds for further optimization studies. The most lipophilic compounds showed higher affinities among benzo-condensed compounds, while imidazolylthioethyl imidazoles were more potent in displacing [3H]NAMHA than thiazolylthioethyl and thiazolylaminoethyl imidazoles which suggests an interaction between the annular NH of the imidazolylthioethyl moiety and the binding site." @default.
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- W2089413283 date "1995-01-01" @default.
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- W2089413283 title "Heteroarylaminoethyl and heteroarylthioethyl imidazoles. Synthesis and H3-receptor affinity" @default.
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- W2089413283 doi "https://doi.org/10.1016/0223-5234(96)88307-3" @default.
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