Sedative action of some substituted benzylamides

Area of Science:

• Pharmacology
• Medicinal Chemistry

Background:

• Amino acylamide derivatives are explored for pharmacological properties.
• Existing local anesthetics like lignocaine and procaine serve as benchmarks.

Purpose of the Study:

• To synthesize and evaluate substituted benzylamide derivatives of amino acylamide (compounds A-D).
• To assess their potential as local anesthetics and CNS-active agents.
• To investigate their effects on neuromuscular activity, cardiovascular parameters, and behavior.

Main Methods:

• Synthesis of four substituted benzylamide derivatives of amino acylamide.
• Pharmacological evaluation including local anesthetic, sedative, locomotor activity, and anticonvulsant assays.
• Assessment of effects on hexobarbitone-induced hypnosis, methylamphetamine-induced hypermotor activity, and isolated frog heart.
• Cardiovascular studies in dogs and determination of LD50 values.

Main Results:

• Compounds A-D exhibited lower local anesthetic potency compared to lignocaine and procaine.
• All compounds demonstrated significant sedation, reduced spontaneous locomotor activity, and potentiated hexobarbitone hypnosis.
• Compound A antagonized methylamphetamine-induced hypermotor activity.
• Three compounds antagonized calcium-induced cardiac arrest in isolated frog hearts.
• A transient fall in blood pressure was observed in dogs (except for compound C), unaffected by atropine or propranolol.
• Compounds showed neuromuscular blockade and mild analgesic activity, but lacked anticonvulsant and tranquilizing effects.
• LD50 values ranged from 164.1 to 416 mg/kg.

Conclusions:

• Substituted benzylamide derivatives of amino acylamide possess notable sedative and neuromuscular blocking properties.
• These compounds show potential for further investigation, despite limited local anesthetic and anticonvulsant activities.
• The observed cardiovascular effects warrant further study.