Compounds with gastric antisecretory activity. 1. Phenoxyalkylamines

Area of Science:

• Medicinal Chemistry
• Pharmacology
• Gastroenterology

Background:

• Histamine is a key mediator of gastric acid secretion.
• Classical H1 antagonists serve as a basis for developing novel therapeutic agents.
• Understanding the molecular mechanisms of gastric acid regulation is crucial for treating acid-related disorders.

Purpose of the Study:

• To synthesize and evaluate a series of novel 0-alkylphenoxyalkylamines for their effect on gastric acid secretion.
• To identify potent inhibitors of histamine-induced gastric acid secretion.
• To characterize the pharmacological profile of the most active compounds.

Main Methods:

• Synthesis of 0-alkylphenoxyalkylamines derived from H1 antagonists.
• Novel reaction of 1-bromoadamantane with 4-hydroxycoumarin using diethyl phosphonate.
• Hydrolysis of intermediate product to yield 0-acylphenol.
• Assay of histamine-induced gastric acid secretion inhibition.
• Evaluation of anticholinergic, antiinflammatory, anticonvulsant, sedative, and H1-antihistaminic activities.

Main Results:

• A series of 0-alkylphenoxyalkylamines were synthesized and tested.
• Trans-1-[2[2-[2-(1-adamantyl)vinyl] phenoxy] ethyl]pyrrolidine (54) demonstrated potent inhibition of gastric acid secretion.
• Compound 54 was confirmed not to be an H2 antagonist.
• Compound 54 exhibited no significant anticholinergic, antiinflammatory, anticonvulsant, sedative, or H1-antihistaminic activity.

Conclusions:

• Novel adamantylvinyl pyrrolidine derivatives effectively inhibit gastric acid secretion.
• The precise mechanism of action for compound 54 remains to be elucidated.
• Compound 54 represents a potential lead for developing new gastrointestinal therapeutic agents independent of H1 or H2 receptor antagonism.