Abstract
Hit compound 1, a selective noradrenaline re-uptake transporter (NET) inhibitor was optimised to build in potency at the serotonin re-uptake transporter (SERT) whilst maintaining selectivity against the dopamine re-uptake transporter (DAT). During the optimisation of 1 it became clear that selectivity against the Kv11.1 potassium ion channel (hERG) was also a parameter for optimisation within the series. Discrete structural changes to the molecule as well as a lowering of global cLogP successfully increased the hERG selectivity to afford compound 11m, which was efficacious in a mouse model of inflammatory pain, complete Freund’s adjuvant (CFA) induced thermal hyperalgesia and a rat model of neuropathic pain, spinal nerve ligation (SNL) induced mechanical allodynia.
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