Tricyclic Triazoles as σ1Receptor Antagonists for Treating Pain - Sophion

Tricyclic Triazoles as σ1Receptor Antagonists for Treating Pain

Author(s): Díaz, J. L., Cuevas, F., Oliva, A. I., Font, D., Sarmentero, M. Á., Álvarez-Bercedo, P., López-Valbuena, J. M., Pericàs, M. A., Enrech, R., Montero, A., Yeste, S., Vidal-Torres, A., Álvarez, I., Pérez, P., Cendán, C. M., Cobos, E. J., Vela, J. M., & Almansa, C

The synthesis and pharmacological activity of a new series of 5a,7,8,8a-tetrahydro-4H,6H-pyrrolo[3,4-b][1,2,3]triazolo[1,5-d][1,4]oxazine derivatives as potent sigma-1 receptor (σ1R) ligands are reported. A lead optimization program aimed at improving the aqueous solubility of parent racemic nonpolar derivatives led to the identification of several σ1R antagonists with a good absorption, distribution, metabolism, and excretion in vitro profile, no off-target affinities, and characterized by a low basic pKa (around 5) that correlates with high exposure levels in rodents. Two compounds displaying a differential brain-to-plasma ratio distribution profile, 12lR and 12qS, exhibited a good analgesic profile and were selected as preclinical candidates for the treatment of pain.