Bioisosteres of 9-Carboxymethyl-4-oxo-imidazo[1,2- a ]indeno[1,2- e ]pyrazin-2-carboxylic acid derivatives. Progress towards selective, potent In Vivo AMPA antagonists with longer durations of action
A novel series of 2- and 9-disubstituted heterocyclic-fused 4-oxo-indeno[1,2-e]pyrazin derivatives was synthesized. One of them, the 9-(1 H-tetrazol-5-ylmethyl)-4-oxo-5,10-dihydroimidazo[1,2-a]indeno[1,2-e]pyrazin-2-yl phosphonic acid 4i exhibited a strong and a selective binding affinity for the AMPA receptor (IC50 = 13 nM) and demonstrated potent antagonist activity (IC50 = 6 nM) at the ionotropic AMPA receptor. This compound also displayed good anticonvulsant properties against electrically-induced convulsions after ip and iv administration with ED50 values between 0.8 and 1 mg/kg. Furthermore, a strong increase in potency was observed when given iv 3 h before test (ED50 = 3.5 instead of 25.6 mg/kg for the corresponding 9-carboxymethyl-2-carboxylic acid analogue). These data confirmed that there is an advantage in replacing the classical carboxy substituents by their bioisosteres such as tetrazole or phosphonic acid groups. (C) 2001 Elsevier Science Ltd. All rights reserved.
DERIVES DE 5H,10H-IMIDAZO[1,2-a]INDENO[1,2-e]PYRAZINE-4-ONE ANTAGONISTES DES RECEPTEURS AMPA ET NMDA, LEUR PREPARATION, LEURS INTERMEDIAIRES ET LES MEDICAMENTS LES CONTENANT
申请人:Aventis Pharma S.A.
公开号:EP0880522B1
公开(公告)日:2001-09-19
DERIVES DE 5H,10H-IMIDAZO(1,2-a)INDENO(1,2-e)PYRAZINE-4-ONE, LEUR PREPARATION, LEURS INTERMEDIAIRES ET LES MEDICAMENTS LES CO NTENANT