摘要:
Starting from two carbocyclic analogs, a series of 3,3-dimethylpiperidine derivatives was prepared and tested in radioligand binding assays at sigma(1) and sigma(2) receptors, and at Delta(8)-Delta(7) sterol isomerase (SI) site. The novel compounds mostly bear heterocyclic rings or bicyclic nucleus of differing lipophilicities. Compounds 18a and 19a,b demonstrated the highest sigma(1) affinity (K-i = 0.14-0.38 nM) with a good selectivity versus sigma(2) binding. Among them, 18a had the lowest C log D value (3.01) and only 19b was selective versus SI too. Generally, it was observed that more planar and hydrophilic heteronuclei conferred a decrease in affinity for both sigma receptor subtypes. (C) 2011 Elsevier Ltd. All rights reserved.