5 research outputs found
Application of a Parallel Synthetic Strategy in the Discovery of Biaryl Acyl Sulfonamides as Efficient and Selective Na<sub>V</sub>1.7 Inhibitors
The
majority of potent and selective hNa<sub>V</sub>1.7 inhibitors possess
common pharmacophoric features that include a heteroaryl sulfonamide
headgroup and a lipophilic aromatic tail group. Recently, reports
of similar aromatic tail groups in combination with an acyl sulfonamide
headgroup have emerged, with the acyl sulfonamide bestowing levels
of selectivity over hNa<sub>V</sub>1.5 comparable to the heteroaryl
sulfonamide. Beginning with commercially available carboxylic acids
that met selected pharmacophoric requirements in the lipophilic tail,
a parallel synthetic approach was applied to rapidly generate the
derived acyl sulfonamides. A biaryl acyl sulfonamide hit from this
library was elaborated, optimizing for potency and selectivity with
attention to physicochemical properties. The resulting novel leads
are potent, ligand and lipophilic efficient, and selective over hNa<sub>V</sub>1.5. Representative lead <b>36</b> demonstrates selectivity
over other human Na<sub>V</sub> isoforms and good pharmacokinetics
in rodents. The biaryl acyl sulfonamides reported herein may also
offer ADME advantages over known heteroaryl sulfonamide inhibitors
Sulfonamides as Selective Na<sub>V</sub>1.7 Inhibitors: Optimizing Potency and Pharmacokinetics While Mitigating Metabolic Liabilities
Several reports have recently emerged
regarding the identification
of heteroarylsulfonamides as Na<sub>V</sub>1.7 inhibitors that demonstrate
high levels of selectivity over other Na<sub>V</sub> isoforms. The
optimization of a series of internal Na<sub>V</sub>1.7 leads that
address a number of metabolic liabilities including bioactivation,
PXR activation, as well as CYP3A4 induction and inhibition led to
the identification of potent and selective inhibitors that demonstrated
favorable pharmacokinetic profiles and were devoid of the aforementioned
liabilities. The key to achieving this within a series prone to transporter-mediated
clearance was the identification of a small range of optimal cLogD
values and the discovery of subtle PXR SAR that was not lipophilicity
dependent. This enabled the identification of compound <b>20</b>, which was advanced into a target engagement pharmacodynamic model
where it exhibited robust reversal of histamine-induced scratching
bouts in mice
Sulfonamides as Selective Na<sub>V</sub>1.7 Inhibitors: Optimizing Potency, Pharmacokinetics, and Metabolic Properties to Obtain Atropisomeric Quinolinone (AM-0466) that Affords Robust in Vivo Activity
Because of its strong genetic validation,
Na<sub>V</sub>1.7 has
attracted significant interest as a target for the treatment of pain.
We have previously reported on a number of structurally distinct bicyclic
heteroarylsulfonamides as Na<sub>V</sub>1.7 inhibitors that demonstrate
high levels of selectivity over other Na<sub>V</sub> isoforms. Herein,
we report the discovery and optimization of a series of atropisomeric
quinolinone sulfonamide inhibitors [Bicyclic sulfonamide compounds as sodium channel inhibitors
and their preparation. WO 2014201206, 2014] of Na<sub>V</sub>1.7, which demonstrate nanomolar inhibition of
Na<sub>V</sub>1.7 and exhibit high levels of selectivity over other
sodium channel isoforms. After optimization of metabolic and pharmacokinetic
properties, including PXR activation, CYP2C9 inhibition, and CYP3A4
TDI, several compounds were advanced into in vivo target engagement
and efficacy models. When tested in mice, compound <b>39</b> (AM-0466) demonstrated robust pharmacodynamic activity in a Na<sub>V</sub>1.7-dependent model of histamine-induced pruritus (itch) and
additionally in a capsaicin-induced nociception model of pain without
any confounding effect in open-field activity
Sulfonamides as Selective Na<sub>V</sub>1.7 Inhibitors: Optimizing Potency, Pharmacokinetics, and Metabolic Properties to Obtain Atropisomeric Quinolinone (AM-0466) that Affords Robust in Vivo Activity
Because of its strong genetic validation,
Na<sub>V</sub>1.7 has
attracted significant interest as a target for the treatment of pain.
We have previously reported on a number of structurally distinct bicyclic
heteroarylsulfonamides as Na<sub>V</sub>1.7 inhibitors that demonstrate
high levels of selectivity over other Na<sub>V</sub> isoforms. Herein,
we report the discovery and optimization of a series of atropisomeric
quinolinone sulfonamide inhibitors [Bicyclic sulfonamide compounds as sodium channel inhibitors
and their preparation. WO 2014201206, 2014] of Na<sub>V</sub>1.7, which demonstrate nanomolar inhibition of
Na<sub>V</sub>1.7 and exhibit high levels of selectivity over other
sodium channel isoforms. After optimization of metabolic and pharmacokinetic
properties, including PXR activation, CYP2C9 inhibition, and CYP3A4
TDI, several compounds were advanced into in vivo target engagement
and efficacy models. When tested in mice, compound <b>39</b> (AM-0466) demonstrated robust pharmacodynamic activity in a Na<sub>V</sub>1.7-dependent model of histamine-induced pruritus (itch) and
additionally in a capsaicin-induced nociception model of pain without
any confounding effect in open-field activity