Synthesis, testing and structure-activity studies on a library of 5-HT₄ ligands.

Area of Science:

• Medicinal Chemistry
• Neuroscience
• Pharmacology

Background:

• The serotonin 5-HT₄ receptor is a key target for various therapeutic applications.
• Understanding the structure-activity relationships of receptor ligands is crucial for drug discovery.

Purpose of the Study:

• To design, synthesize, and evaluate novel indole derivatives as 5-HT₄ receptor ligands.
• To explore structure-activity relationships (SAR) of 5-HT₄ ligands using computational methods.

Main Methods:

• Synthesis of diverse indole derivatives and analogues.
• In vitro binding assays to determine receptor affinity (pKi).
• Comparative Molecular Field Analysis (CoMFA) for pharmacophore modeling.

Main Results:

• Several synthesized compounds exhibited good affinity for the 5-HT₄ receptor.
• Compound 20 demonstrated high affinity with a pKi of 8.54.
• CoMFA analysis refined the pharmacophore model, identifying new molecular features.

Conclusions:

• The study successfully identified potent indole-based 5-HT₄ receptor ligands.
• The developed pharmacophore model provides insights for designing novel ligands.
• A novel tetrahydroquinoline analogue fits the pharmacophore model and shows promising pharmacology.