Exploring 1-adamantanamine as an alternative amine moiety for metabolically labile azepane ring in newly synthesized benzo[d]thiazol-2(3H)one σ receptor ligands
作者:Sebastiano Intagliata、Hebaalla Agha、Theresa A. Kopajtic、Jonathan L. Katz、Shyam H. Kamble、Abhisheak Sharma、Bonnie A. Avery、Christopher R. McCurdy
DOI:10.1007/s00044-020-02597-2
日期:2020.9
In this work we report the structure-affinity relationships, binding properties, and metabolic stability studies of a series of benzo[d]thiazol-2(3H)one as sigma receptor (sigma R) ligands. Specifically, to improve the metabolic stability of the cyclic amine fragment of our lead compound (SN56), the metabolically unstable azepane ring was replaced with a 1-adatamantamine moiety. Within the synthesized analogs, compound12had low nanomolar affinity for the sigma R-1 (K-i = 7.2 nM) and moderate preference (61-fold) over the sigma R-2. In vitro metabolic stability studies showed a slight improvement of the metabolic stability for7-12, even though an extensive metabolism in rat liver microsomes is being observed. Furthermore, metabolic soft spot identification of12suggested that theN-methyl group of the adamantyl moiety is a major site of metabolism.