New antiarrhythmic agents. 7. 2,3-Diaminopropionanilides

Area of Science:

• Medicinal Chemistry
• Pharmacology

Background:

• Developing novel antiarrhythmic agents is crucial for managing cardiac arrhythmias.
• Exploring new chemical scaffolds for local anesthetics can lead to improved therapeutic options.

Purpose of the Study:

• To synthesize and evaluate a series of 2,3-diaminopropionanilides for antiarrhythmic and local anesthetic activities.
• To assess the central nervous system toxicity and duration of action of these novel compounds.

Main Methods:

• Synthesis of 2,3-diaminopropionanilides via acylation and amination.
• In vivo evaluation of antiarrhythmic efficacy in mice (chloroform-induced tachycardia).
• Assessment of central nervous system toxicity in mice and local anesthetic activity (sciatic nerve block in rats).

Main Results:

• Several synthesized compounds demonstrated significantly higher antiarrhythmic potencies compared to lidocaine.
• However, these potent antiarrhythmic agents also exhibited considerable central nervous system toxicity.
• Local anesthetic evaluation showed durations of sciatic nerve block comparable to lidocaine, without the prolonged effect of etidocaine.

Conclusions:

• The synthesized 2,3-diaminopropionanilides represent a promising class of compounds with potent antiarrhythmic activity.
• Further structural modifications are warranted to mitigate toxicity and optimize the therapeutic profile for antiarrhythmic applications.
• The compounds show potential as local anesthetics with efficacy similar to lidocaine.