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(R)- And (S)-11-hydroxy-10-methylaporphine 1 and 2 are, respectively, a potent, highly specific serotonergic (5-HT1A) agonist and antagonist. In an ongoing structure-activity study, racemates of the positional isomers 8-hydroxy-9-methyl- and 8-methyl-9-hydroxyaporphine were prepared by modifications of literature methods and were resolved. The methyl ethers of the target compounds were also evaluated pharmacologically. All of the free phenolic derivatives [(+)- and (-)-8 and 10] were inert in an assay for 5-HT1A receptor activity. All of the methyl ethers [(+)- and (-)-9 and 11] demonstrated quantitatively similar low potency stimulant effect at 5-HT1A receptors. The agonist or antagonist activity exhibited by 1 and 2 reflects the high degree of structural specificity required of aporphine derivatives for action at 5-HT1A receptors.
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