Aldosterone antagonists. 2. New 7 alpha-(acetylthio)-15,16-methylene spirolactones

Area of Science:

• Medicinal Chemistry
• Pharmacology
• Endocrinology

Background:

• Spironolactone is a standard aldosterone antagonist.
• Existing aldosterone antagonists may have undesirable endocrinological effects.
• There is a need for more potent and selective aldosterone antagonists.

Purpose of the Study:

• To synthesize novel 15,16-methylene derivatives of spironolactone.
• To enhance antialdosterone potency.
• To reduce unwanted endocrinological effects, specifically antiandrogenic activity.

Main Methods:

• Chemical synthesis of 15,16-methylene derivatives of spironolactone.
• Introduction of a 1,2-double bond and a 15 beta,16 beta-methylene ring.
• Pharmacological evaluation in animal models to assess antialdosterone and antiandrogenic activities.

Main Results:

• Successful synthesis of 15,16-methylene spironolactone derivatives.
• Mespirenone demonstrated threefold-greater antialdosterone potency compared to spironolactone.
• Mespirenone exhibited less than 10% of the antiandrogenic activity of spironolactone.

Conclusions:

• The synthesized 15,16-methylene derivatives, particularly mespirenone, effectively increase antialdosterone potency.
• These novel compounds show reduced antiandrogenic activity, addressing key limitations of spironolactone.
• Mespirenone represents a promising candidate for improved aldosterone antagonism therapy.