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Arvidsson LE, Hacksell U, Johansson AM, Nilsson JL, Lindberg P, Sanchez D, Wikström H, Svensson K, Hjorth S, Carlsson A. 
“8-Hydroxy-2-(alkylamino)tetralins and related compounds as central 5-hydroxytryptamine receptor agonists”. 
J Med Chem. 1984 Jan 20;27(1):45-51.
A series of 2-(alkylamino)tetralins related to 8-hydroxy-2-(di-n-propylamino)tetralin (21) were prepared and tested as dopamine (DA) and 5-hydroxytryptamine (5-HT) receptor agonists. Several of the compounds were potent 5-HT agonists devoid of DA-mimetic effects. N-Ethyl or N-propyl substitution of 8-hydroxy-2-aminotetralin gave the most potent agonists. It was shown that the most potent compound, (+)-21, has the 2R configuration. 5,8-Di-methoxy-2-(di-n-propylamino)tetralin (31) was found to be a weak DA agonist devoid of 5-HT activity. The corresponding indan derivative, 4,7-dimethoxy-2-(di-n-propylamino)indan (39), has been reported to be active on both DA and 5-HT receptors. The 5-HT-stimulating properties of compounds 21 and 39 as compared to the incapability of compound 31 to activate the 5-HT receptor is tentatively explained by the assumed mode of binding of the compounds to the 5-HT receptor.
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