Synthesis and evaluation of novel azetidine analogs as potent inhibitors of vesicular [3H]dopamine uptake
摘要:
Lobelane analogs that incorporate a central piperidine or pyrrolidine moiety have previously been reported by our group as potent inhibitors of VMAT2 function. Further central ring size reduction of the piperidine moiety in lobelane to a four-membered heterocyclic ring has been carried out in the current study to afford novel cis-and trans-azetidine analogs. These azetidine analogs (15a-15c and 22a-22c) potently inhibited [H-3]dopamine (DA) uptake into isolated synaptic vesicles (K-i <= 66 nM). The cis-4-methoxy analog 22b was the most potent inhibitor (K-i = 24 nM), and was twofold more potent that either lobelane (2a, K-i = 45 nM) or norlobelane (2b, K-i = 43 nM). The trans-methylenedioxy analog, 15c (K-i = 31 nM), was equipotent with the cis-analog, 22b, in this assay. Thus, cis-and trans-azetidine analogs 22b and 15c represent potential leads in the discovery of new clinical candidates for the treatment of methamphetamine abuse. (C) 2013 Elsevier Ltd. All rights reserved.
Synthesis and evaluation of novel azetidine analogs as potent inhibitors of vesicular [3H]dopamine uptake
摘要:
Lobelane analogs that incorporate a central piperidine or pyrrolidine moiety have previously been reported by our group as potent inhibitors of VMAT2 function. Further central ring size reduction of the piperidine moiety in lobelane to a four-membered heterocyclic ring has been carried out in the current study to afford novel cis-and trans-azetidine analogs. These azetidine analogs (15a-15c and 22a-22c) potently inhibited [H-3]dopamine (DA) uptake into isolated synaptic vesicles (K-i <= 66 nM). The cis-4-methoxy analog 22b was the most potent inhibitor (K-i = 24 nM), and was twofold more potent that either lobelane (2a, K-i = 45 nM) or norlobelane (2b, K-i = 43 nM). The trans-methylenedioxy analog, 15c (K-i = 31 nM), was equipotent with the cis-analog, 22b, in this assay. Thus, cis-and trans-azetidine analogs 22b and 15c represent potential leads in the discovery of new clinical candidates for the treatment of methamphetamine abuse. (C) 2013 Elsevier Ltd. All rights reserved.