Dibenzotropone- and dibenzosuberonecarboxylic acids with bronchodilator activity

Area of Science:

• Medicinal Chemistry
• Pharmacology
• Organic Synthesis

Background:

• Asthma and respiratory diseases represent a significant global health burden.
• Existing bronchodilator therapies have limitations, necessitating the development of novel agents.
• Dibenzo[a,d]cyclohepten-5-one scaffold has shown potential in modulating respiratory functions.

Purpose of the Study:

• To synthesize novel 5H-dibenzo[a,d]cyclohepten-5-one derivatives.
• To evaluate the bronchodilator and anti-histaminic properties of these synthesized compounds.
• To identify structure-activity relationships for optimizing bronchodilator potential.

Main Methods:

• Synthesis of 44 5H-dibenzo[a,d]cyclohepten-5-one derivatives with carboxyl groups at specific positions.
• In vivo testing in guinea pigs to assess bronchodilator activity.
• Administration of histamine challenges via aerosol and intravenous routes to evaluate protective effects.

Main Results:

• Several synthesized derivatives exhibited significant bronchodilator activity in guinea pigs.
• Compounds demonstrated protection against both aerosol and intravenous histamine challenges.
• 10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one-2-carboxylic acids with 9-position methyl or halogen substituents were most potent.
• These lead compounds displayed activity comparable to aminophylline.

Conclusions:

• The synthesized dibenzo[a,d]cyclohepten-5-one derivatives represent a promising class of bronchodilator agents.
• Specific structural modifications, such as 9-position substitution, enhance bronchodilator efficacy.
• These findings warrant further investigation for potential therapeutic applications in respiratory diseases.