Synthesis and SAR studies of 2-oxoquinoline derivatives as CB2 receptor inverse agonists

Katri H Raitio, Juha R Savinainen, Jouko Vepsäläinen, Jarmo T Laitinen, Antti Poso, Tomi Järvinen, Tapio Nevalainen
Journal of Medicinal Chemistry 2006 March 23, 49 (6): 2022-7
The highly CB2 selective cannabinoid receptor inverse agonist, 7-methoxy-2-oxo-8-pentyloxy-1,2-dihydroquinoline-3-carboxylic acid N-benzo[1,3]dioxol-5-ylmethyl)amide (JTE-907; 9b), served as the lead compound for investigating the structure-activity relationships of its analogues and in the search for more potent and effective CB2 receptor inverse agonists. A series of aromatic amides of 7-methoxy-2-oxo-8-pentyloxy-1,2-dihydroquinoline-3-carboxylic acid 6 was synthesized, and the CB2 receptor activities of the compounds were determined by a [35S]GTPgammaS-binding assay using membranes of CHO cells stably transfected with the human CB2 receptor. As a result, all the compounds were defined as full CB2 receptor inverse agonists, and additionally, except for two 3,4-dihydroxyphenylalkylamides, they were found to be equally potent as SR144528.

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