Abstract
Analogues of the potent anticholinergic 2-(4-phenylpiperidino)cyclohexanol (vesamicol, 1) in which the cyclohexyl fragment was replaced with an N-acyl or N-alkyl trans-decahydroquinolyl moiety were synthesized and evaluated as potential ligands for the vesicular acetylcholine transporter (VAChT). The binding of compounds, such as 18, 20, and 21, was both stereospecific and of comparable magnitude to that of the closely related vesamicol analogue 2,3-trans-4a, 8a-trans-3-hydroxy-2-(4-phenylpiperidino)-1,2,3,4,5,6,7, 8-decahydronaphthalene (6) which displays subnanomolar affinity for this transporter. However, these compounds also demonstrated high affinities for sigma(1) and sigma(2) receptors and thus failed to show significantly improved selectivity over previously reported vesamicol analogues.
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