New combination of pharmacophoric elements of potent σ1 ligands: Design, synthesis and σ receptor affinity of aminoethyl substituted tetrahydrobenzothiophenes
作者:Dipak Harel、Dirk Schepmann、Bernhard Wünsch
DOI:10.1016/j.ejmech.2013.09.006
日期:2013.11
The aminoethyl substituted tetrahydrobenzothiophenes 4 resulted from combination of the pharmacophoric elements of the potent cri ligands 2 and 3. The aminoethyl substituted tetrahydrobenzothiophenes 4 were prepared in an 8-step synthesis starting with thiophene. Whereas the rri affinity of the N-benzyl derivative 4a is in the medium nanomolar range (K-i = 49 nM), the analogous N-cyclohexylmethyl derivative 4d exhibits low nanomolar affinity (Ki = 5.0 nM). The reduced sigma(1) affinity and sigma(2)/sigma(1) selectivity of tetrahydrobenzothiophenes 4 compared to analogous spirocyclic piperidines 3 is attributed to the increased conformational flexibility of the aminoethyl side chain. (C) 2013 Elsevier Masson SAS. All rights reserved.