Structure-activity relationship of some new anti-arrhythmic phenytoin derivatives.

Abstract

The pharmacological activity of nine anti-arrhythmic phenytoin derivatives was assessed in preventing chloroform-induced arrhythmia. The compounds were tested in vitro on isolated heart of the rat. Four compounds were chosen as representative of the spatial characteristics of the studied group, and X-ray structure analyses were carried out on them. Because the protonated form is present in physiological milieu, conformational analysis was performed on the protonated form of the four representatives and in addition on the compound showing the highest anti-arrhythmic activity. It was found that substitution of the imidazolidinone ring of phenytoin at position 3 by a chain containing a tertiary amine nitrogen atom changes the affinity profile from inactivated (phenytoin-like) to activated (quinidine-like) cardiac sodium channels. The activity of the studied compounds relies on the presence of protonated tertiary nitrogen atom, at least one phenyl ring, and flexibility of the molecule, which enables the spacer to assume a desired length.

• Authors: M Ciechanowicz-Rutkowska, K Stadnicka, K Kiec-Kononowicz, H Byrtus, B Filipek, M Zygmunt, D Maciag
• Journal: Archiv der Pharmazie (Arch Pharm (Weinheim)) Vol. 333 Issue 11 Pg. 357-64 (Nov 2000) ISSN: 0365-6233 [Print] Germany
• PMID: 11129977 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Anti-Arrhythmia Agents
• Phenytoin

Topics

• Animals
• Anti-Arrhythmia Agents (chemistry, pharmacology)
• Coronary Circulation (drug effects)
• Heart (drug effects, physiology)
• Heart Rate (drug effects)
• In Vitro Techniques
• Models, Molecular
• Molecular Conformation
• Phenytoin (analogs & derivatives, chemistry, pharmacology)
• Rats
• Structure-Activity Relationship