Search results for "conformational restriction"

showing 2 items of 2 documents

Stereoselective Synthesis and Pharmacological Evaluation of 2,4-Bridged Piperidine Derivatives Designed to Activate the κ-Opioid Receptor

2021

endo-configurationdiastereoselective reductive aminationenantiomeric excessstructure-affinity relationshipNOESY spectrumKOR agonistconformational restrictionchiral HPLCSettore CHIM/08 - Chimica Farmaceutica2-azabicyclo[3.3.1]octanecis/trans configuration
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Synthesis of 8-aminomorphans with high KOR affinity

2021

2-Azabicyclo[3.3.1]nonanes (morphans) with a (3,4-dichlorophenyl)acetyl group at 2-position and a pyrrolidino moiety at 8-position were designed as conformationally restricted analogs of piperidine-based KOR agonists. The synthesis started with 4-oxopiperidine-2-carboxylic acid comprising 13 reaction steps. At first the ketone 10 was transformed into diester 7 bearing a propionate side chain. Dieckmann condensation of diester 7 to afford bicyclic enolester 14 and subsequent Krapcho deethoxycarbonylation represent the key steps of the synthesis. The enantiomeric pyrrolidines (1S,5R,8R)-5a and (1R,5S,8S)-5a were separated by chiral HPLC. The eutomer (1S,5R,8R)-5a showed high KOR affinity (K-i…

Diastereoselective reductive aminationEnantiomeric excessStructure-affinity relationshipsPharmacologyPyrrolidinesReceptors Opioid kappaNOESY spectrumOrganic ChemistryMolecular ConformationStereoisomerismGeneral MedicineKOR agonistsEndo-configurationStructure-Activity RelationshipKOR pharmacophoreConformational restrictionChiral HPLCDihedral angleDrug DiscoveryCis/trans-configurationMorphan2-azabicyclo[3.3.1]nonaneEuropean Journal of Medicinal Chemistry
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