Abstract:
:The imidazoquinoline (R)-5,6-Dihydro-N,N-dimethyl-4H-imidazo[4,5,1-ij]quinolin-5-amine [(R)-3] is a potent dopamine agonist when tested in animals but surprisingly shows very low affinity in in vitro binding assays. When incubated with mouse or monkey liver S9 microsomes, (R)-3 is metabolized by N-demethylation and oxidation to (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5,1-ij]quinolin-2(1H) -one [(R)-6], intermediate metabolites, where N-demethylation to the imidazoquinoline (R)-4 and where oxidation to the imidazoquinolinone (R)-5 has taken place, are also observed in these incubates. A cross-species study on the metabolism of (R)-3 in vitro has shown large variations in the extent of metabolism from species to species. Imidazoquinolinones (R)-5 and (R)-6 have comparable activity to (R)-3 in animals and also show good dopaminergic (D2) and serotonergic (5HT1A) activities in binding assays. It is probable that these metabolites account at least in part for the in vivo activity found for (R)-3. Efficient syntheses for compounds 3-6 as single enantiomers from quinoline are presented together with information on the biological activities and metabolic stabilities of these compounds.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Heier RF,Dolak LA,Duncan JN,Hyslop DK,Lipton MF,Martin IJ,Mauragis MA,Piercey MF,Nichols NF,Schreur PJ,Smith MW,Moon MWdoi
10.1021/jm960360qsubject
Has Abstractpub_date
1997-02-28 00:00:00pages
639-46issue
5eissn
0022-2623issn
1520-4804pii
jm960360qjournal_volume
40pub_type
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