Synthesis and Biological Evaluation at Nicotinic Acetylcholine Receptors of N-Arylalkyl- and N-Aryl-7-Azabicyclo[2.2.1]heptanes
摘要:
A new series of N-arylalkyl-substituted 7-azabicyclo[2.2.1]heptanes and N-aryl-substituted 7-azabicyclo[2.2.1]heptanes were synthesized and evaluated as potential ligands for neuronal nicotinic acetylcholine receptors. The in vitro binding affinities (K-i) of the 7-azabicyclo[2.2.1]heptane derivatives were measured by inhibition of [H-3]cytisine binding to rat brain tissue. The most potent ligand of the series was found to be N-(3-pyridylmethyl)-7-azabicyclo[2.2.1]heptane (5b, K-i = 98 nM). The chloro analogue (5a, K-i = 245 nM) 5a and epibatidine (1) produced dose-dependent analgesia in both hotplate and tail-flick tests when administered subcutaneously. However, when compounds 1 and 5a,b were administered intrathecally, all produced analgesia in the tail-flick test but only 5a produced analgesia in the hotplate test.
7-Azabicyclo[2.2.1]heptane as a scaffold for the development of selective sigma-2 (σ2) receptor ligands
作者:Samuel D. Banister、Louis M. Rendina、Michael Kassiou
DOI:10.1016/j.bmcl.2012.04.077
日期:2012.6
A series of N-substituted 7-azabicyclo[2.2.1]heptanes (12–17 and 22–25) and similarly substituted pyrrolidines (32–36 and 41–44) were synthesized as sterically-reduced, achiral analogs of adamantane- and trishomocubane-derived σ ligands. In vitro competition binding assays against σ receptors revealed that arylalkyl N-substituents conferred selectivity for the σ2 subtype, while alicyclic or polycarbocyclic