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- W4237530890 abstract "A number of 2',3'-disubstituted epibatidine analogues were synthesized and evaluated in vitro for potency at nicotinic acetylcholine receptors (nAChRs) and in vivo for antinociception activity in the tail-flick and hot-plate models of acute pain and for their ability to affect core body temperature. Compounds that possessed electron-withdrawing groups (F, Cl, Br, and I) in both the 2'- and the 3'-positions showed affinities at the nAChR similar to epibatidine. However, in vivo efficacy did not correlate with affinity. 2-exo-(3'-Amino-2'-chloro-5'-pyridinyl)-7-azabicyclo[2.2.1]heptane (2i), an epibatidine analogue possessing an electron-releasing amino group in the 3'-position, produced the highest affinity. Compound 2i was also the most selective epibatidine analogue with a K(i) of 0.001 nM at alphabeta nAChRs, which is 26 times greater than that of epibatidine, and a alphabeta/alpha(7) K(i) ratio of 14,000, twice that of epibatidine. In vivo testing revealed that this compound potently inhibited nicotine-induced antinociception with AD(50) values below 1 microg/kg. Surprisingly, this same compound was also an agonist at higher doses (ED(50) approximately 20 microg/kg). Thus, the addition of the 3'-amino group to epibatidine confers potent antagonist activity to the compound with little effect on agonist activity. 2,3-Disubstituted epibatidine analogues possessing a 2'-amino group combined with a 3'-bromo or 3'-iodo group showed in vitro and in vivo nAChR properties similar to nicotine." @default.
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- W4237530890 date "2002-09-18" @default.
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- W4237530890 title "Synthesis, Nicotinic Acetylcholine Receptor Binding, and Antinociceptive Properties of 2-<i>e</i><i>xo</i>-2-(2‘,3‘-Disubstituted 5‘-pyridinyl)-7-azabicyclo[2.2.1]heptanes: Epibatidine Analogues" @default.
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- W4237530890 doi "https://doi.org/10.1021/jm0202268" @default.
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