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Cardiotonic 'C' ring modified isomazole analogues.
P Barraclough1, J W Black, D Cambridge
1Department of Medicinal Chemistry, Wellcome Research Laboratories, Beckenham, Kent, UK.
Archiv Der Pharmazie
|August 1, 1990
Summary
New isomazole analogues with electron-withdrawing groups and heterocyclic rings were synthesized. These compounds show similar inotropic effects to isomazole but offer improved cardiovascular profiles in vivo.
Area of Science:
- Medicinal Chemistry
- Cardiovascular Pharmacology
Background:
- Isomazole is a known inotropic agent.
- Development of novel cardiovascular drugs with improved safety profiles is crucial.
Purpose of the Study:
- To synthesize and evaluate novel isomazole analogues as inotropic agents.
- To investigate the impact of specific structural modifications on pharmacological activity and cardiovascular safety.
Main Methods:
- Synthesis of isomazole analogues with achiral electron-withdrawing substituents at the 4'-position.
- Synthesis of analogues featuring heterocyclic 'C' rings.
- In vitro and in vivo evaluation of inotropic and cardiovascular effects.
Main Results:
- Pyridyl substitution in the 'C' ring maintained activity.
- 4'-methylsulphonyl, -cyano, -carboxamido, and acetyl analogues exhibited comparable inotropic potencies to isomazole.
- These novel analogues demonstrated superior cardiovascular profiles in vivo compared to isomazole.
Conclusions:
- Structural modifications, including heterocyclic ring replacement and specific 4'-substituents, yield potent inotropic agents.
- These analogues represent promising candidates for cardiovascular therapies due to enhanced safety profiles.