Indenopyrazole oxime ethers: synthesis and β1-adrenergic blocking activity

Area of Science:

• Medicinal Chemistry
• Cardiovascular Pharmacology

Background:

• Development of novel therapeutic agents for cardiovascular conditions is ongoing.
• Beta-adrenergic receptor antagonists (beta-blockers) are crucial in managing heart diseases.

Purpose of the Study:

• To synthesize and evaluate new beta-blockers based on indeno[1,2-c]pyrazol-4(1H)-one oximes.
• To assess the cardiac activity and receptor interaction of the synthesized compounds.

Main Methods:

• Synthesis of novel indeno[1,2-c]pyrazol-4(1H)-one oxime derivatives.
• Reaction with epichlorohydrin followed by aliphatic amines to yield target compounds.
• Evaluation of cardiac performance modulation in a mammalian heart model.

Main Results:

• Successful synthesis of target compounds (Z/E)-1-phenyl-1H-indeno[1,2-c]pyrazol-4-one O-((2-hydroxy-3-(substituted amino)propyl)oxime (7a-c) and (Z/E)-1-methyl-1H-indeno[1,2-c]pyrazol-4-one O-((2-hydroxy-3-(substituted amino)propyl)oxime (8a-c).
• Compound 7b exhibited a potent depressant effect on cardiac contractility and relaxation.
• Compound 7b competitively antagonized beta1-adrenergic receptors.

Conclusions:

• The synthesized indeno[1,2-c]pyrazol-4-one oxime derivatives show potential as novel beta-blockers.
• Compound 7b is a promising candidate for further investigation in cardiovascular therapeutics due to its selective beta1-adrenergic antagonism and cardiac depressant activity.