Discovery of Functionally Selective 7,8,9,10-Tetrahydro-7,10-ethano-1,2,4-triazolo[3,4-a]phthalazines as GABAAReceptor Agonists at the α3Subunit

Models, Molecular Binding Sites Patch-Clamp Techniques Triazoles Receptors, GABA-A 01 natural sciences Cell Line 0104 chemical sciences Protein Subunits Radioligand Assay Structure-Activity Relationship Xenopus laevis Oocytes Animals Humans Phthalazines Female GABA-A Receptor Agonists
DOI: 10.1021/jm040883v Publication Date: 2005-03-03T05:24:35Z
ABSTRACT
We have previously identified the 7,8,9,10-tetrahydro-7,10-ethano-1,2,4-triazolo[3,4-a]phthalazine (1) as a potent partial agonist for the alpha(3) receptor subtype with 5-fold selectivity in binding affinity over alpha(1). This paper describes a detailed investigation of the substituents on this core structure at both the 3- and 6-positions. Despite evaluating a wide range of groups, the maximum selectivity that could be achieved in terms of affinity for the alpha(3) subtype over the alpha(1) subtype was 12-fold (for 57). Although most analogues showed no selectivity in terms of efficacy, some did show partial agonism at alpha(1) and antagonism at alpha(3) (e.g., 25 and 75). However, two analogues tested (93 and 96), both with triazole substituents in the 6-position, showed significantly higher efficacy for the alpha(3) subtype over the alpha(1) subtype. This was the first indication that selectivity in efficacy in the required direction could be achieved in this series.
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