Add time:08/05/2019 Source:sciencedirect.com
Several lines of evidence suggest that selective sigma-2 (σ2) ligands might be useful for the treatment of solid tumors. However, very few selective σ2 ligands have been identified. This study was aimed at identifying new selective σ2 receptor ligands using a previously identified agent, SYA 013 as a lead. Four groups, homopiperazine, piperazine, tropane and selected oxime analogs of the homopiperazines were identified, synthesized and subsequently screened at the σ1 and σ2 receptors. The results demonstrate that these scaffolds can be modified to obtain selective σ2 receptor ligands. 1-(5-Chloropyridin-2-yl)-4-(3-((4-fluorophenyl)thio)propyl)-1,4-diazepane, 7 and 3-(4-chlorophenyl)-8-(3-((2-fluorophenyl)thio)propyl)-8-azabicyclo[3.2.1]octan-3-ol, 21 were identified as the highest binding affinity ligands (σ2Ki = 2.2 nM) and (4-(4-(5-chloropyridin-2-yl)-1,4-diazepan-1-yl)-1-(4-fluorophenyl)-butan-1-one oxime, 22 as a high affinity and the most selective ligand for the σ2 receptor (σ1Ki/σ2Ki = 41.8).
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