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RESEARCH PRODUCT
Synthesis and Structure-Affinity Relationships of Spirocyclic Benzopyrans with Exocyclic Amino Moiety
Sabrina PriclCarmen AlmansaStefanie BruneDirk SchepmannBernhard WünschFrauke WeberKristina FriedlandErik LauriniElisabeth Kronenbergsubject
synthesisexocyclic amino moietyReceptors Opioid mudocking studieCrystallography X-RayLigands01 natural sciencesopioid receptorschemistry.chemical_compoundProtein structureDrug DiscoveryMoiety0303 health sciencesσ1 receptor ligandsstructure (σ1) affinity relationshipmolecular dynamicBenzyl groupMolecular MedicinesynthesiBenzopyransSelectivityHydrophobic and Hydrophilic Interactionsfree binding enthalpyStereochemistrychange of receptor profileMolecular Dynamics Simulation03 medical and health sciencesStructure-Activity Relationshipσ1 receptor ligands; spirocyclic compounds; benzopyrans; benzofurans; exocyclic amino moiety; synthesis; structure (σ1) affinity relationships; σ1 antagonistic activity; receptor selectivity; molecular dynamics; docking studies; free binding enthalpy; X-ray crystal structure; opioid receptors; MOR affinity; change of receptor profile; structure MOR affinity relationshipsstructure (σ1) affinity relationshipsStructure–activity relationshipHumansReceptors sigmaBenzopyransSpiro Compoundsspirocyclic compoundBinding siteMOR affinity030304 developmental biologybenzopyranbenzofuransσ1 receptor ligandBinding Sitesspirocyclic compoundsreceptor selectivitystructure MOR affinity relationshipsdocking studiesbenzofuranopioid receptorX-ray crystal structuremolecular dynamics0104 chemical sciencesProtein Structure Tertiary010404 medicinal & biomolecular chemistrychemistrySalt bridgeσ1 antagonistic activitydescription
σ1 and/or σ2 receptors play a crucial role in pathological conditions such as pain, neurodegenerative disorders, and cancer. A set of spirocyclic cyclohexanes with diverse O-heterocycles and amino moieties (general structure III) was prepared and pharmacologically evaluated. In structure-activity relationships studies, the σ1 receptor affinity and σ1:σ2 selectivity were correlated with the stereochemistry, the kind and substitution pattern of the O-heterocycle, and the substituents at the exocyclic amino moiety. cis-configured 2-benzopyran cis-11b bearing a methoxy group and a tertiary cyclohexylmethylamino moiety showed the highest σ1 affinity ( Ki = 1.9 nM) of this series of compounds. In a Ca2+ influx assay, cis-11b behaved as a σ1 antagonist. cis-11b reveals high selectivity over σ2 and opioid receptors. The interactions of the novel σ1 ligands were analyzed on the molecular level using the recently reported X-ray crystal structure of the σ1 receptor protein. The protonated amino moiety forms a persistent salt bridge with E172. The spiro[benzopyran-1,1'-cyclohexane] scaffold and the cyclohexylmethyl moiety occupy two hydrophobic pockets. Exchange of the N-cyclohexylmethyl moiety by a benzyl group led unexpectedly to potent and selective μ-opioid receptor ligands.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-01-01 |