Towards multitargeted ligands as pain therapeutics: Dual ligands of the Cavα2δ‐1 subunit of voltage‐gated calcium channel and the μ‐opioid receptor

A series of dual ligands acting on the α2δ-1 subunit of voltage-gated calcium channels and the μ-opioid receptor (MOR) was designed by merging of the two non-structurally related target pharmacophores. The new amino-acidic derivatives are represented by compound 31 (WLB-83038) which exhibits a good drug-like profile and analgesia in several pain models.

Abstract

The synthesis and pharmacological activity of a new series of dual ligands combining activities towards the α2δ-1 subunit of voltage-gated calcium channels (Ca_vα2δ-1) and the μ-opioid receptor (MOR) as novel pain therapeutics are reported. A careful exploration of the pharmacophores related to both targets, which in principle had few common characteristics, led to the design of novel compounds exhibiting both activities. The construction of the dual ligands started from published Ca_vα2δ-1 ligands, onto which MOR ligand pharmacophoric elements were added. This exercise led to new amino-acidic substances with good affinities on both targets as well as good metabolic and physicochemical profiles and low potential for drug-drug interactions. A representative compound, (2S,4S)-4-(4-chloro-3-(((cis)-4-(dimethylamino)-4-phenylcyclohexyl)methyl)-5-fluorophenoxy)pyrrolidine-2-carboxylic acid, displayed promising analgesic activities in several in vivo pain models as well as a reduced side-effect profile in relation to morphine.

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