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Dopamine/Serotonin Receptor Ligands. 16. Expanding Dibenz[d,g]azecines to 11- and 12-Membered Homologues. Interaction with Dopamine D1−D5 Receptors

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posted on 02.04.2020, 16:05 by Christoph Enzensperger, Franziska K. U. Müller, Bärbel Schmalwasser, Petra Wiecha, Heidi Traber, Jochen Lehmann
Oxygenated 7-methyl-5,6,7,8,9,14-hexahydrodibenz[d,g]azecines are potent dopamine receptor antagonists, preferentially at D1/D5. We synthesized the hydroxylated, methoxylated, and chlorinated 11-membered and 12-membered homologues of these 10-membered heterocycles. Their affinities for the human cloned D1−D5 receptors (radioligand binding) and functionalities (calcium assay) were measured. Enlarging the dibenzazecines to the corresponding dibenzazacycloundecenes and dibenzazacyclododecenes generally maintains the high antagonistic affinity for D1/D5 but also leads to a compound with a clozapine-like binding profile due to additional affinity for D4.