Cycloalkyl Indole-2-Carboxylates as Useful Tools for Mapping the "North-Eastern" Region of the Glycine Binding Site Associated with the NMDA Receptor
作者:Fabrizio Micheli、Romano Di Fabio、Anna M. Capelli、Alfredo Cugola、Ornella Curcuruto、Aldo Feriani、Paola Gastaldi、Giovanni Gaviraghi、Carla Marchioro、Alessandra Orlandi、Alfonso Pozzan、Anna M. Quaglia、Angelo Reggiani、Frank van Amsterdam
DOI:10.1002/(sici)1521-4184(19993)332:3<73::aid-ardp73>3.0.co;2-5
日期:1999.3
A novel series of indole-2-carboxylate analogues of GV 150526 (1) in-which the terminal phenyl ring belonging to the side chain present in the position C-3 has been replaced with a bridged cycloalkyl group was synthesized and evaluated for its pharmacological profile. Modelling studies on this class of novel glycine antagonist allowed us to identify an asymmetric lipophilic pocket present in the "North-Eastern" region of the pharmacophoric model of the glycine binding site associated to the NMDA receptor. Among the derivatives prepared, 3-[2-(1-adamantylaminocarbonyl)ethenyl]-4,6-dichloroindole-2-carboxylic acid 6b and 3-[2(norbornylaminocarbonyl)ethenyl]-4,6-dichloroindole-2-carboxylic acid 61 were found to be antagonists acting at the strychnine-insensitive glycine binding site, showing nanomolar affinity for the glycine binding site (K-i = 63 and 19 nM, respectively), coupled with high glutamate receptor selectivity (IC50 > 10(-5) M at the NMDA, AMPA, KA binding sites) and high in vivo potency after :systemic administration by inhibition of convulsion induced by NMDA in mice.