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18,21-Anhydroaldosterone and derivatives.

M Harnik1, Y Kashman, M Cojocaru

  • 1Department of Biotechnology, Tel-Aviv University, Israel.

Steroids
|July 1, 1989
PubMed
Summary

Researchers synthesized anhydroaldosterone and related compounds from aldosterone derivatives. Acid hydrolysis of ketal derivatives and direct dehydration of steroids were key methods for preparing these novel compounds.

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Area of Science:

  • Steroid chemistry
  • Organic synthesis
  • Analytical chemistry

Background:

  • Aldosterone and its derivatives are crucial steroid hormones.
  • Understanding their metabolites and related compounds is vital for physiological and diagnostic studies.
  • Acid-processed urine samples may contain unique steroid structures.

Purpose of the Study:

  • To synthesize specific anhydroaldosterone derivatives.
  • To explore synthetic routes for these compounds.
  • To investigate the stability and interconversion of these steroids.

Main Methods:

  • Preparation of 18,21-anhydroaldosterone and 18,21-anhydro-19-noraldosterone via acid-catalyzed ketal cleavage.
  • Direct dehydration of aldosterone and 19-noraldosterone to yield anhydro compounds.
  • Reverse ring-opening reactions using specific acid mixtures.

Main Results:

  • Successful synthesis of 18,21-anhydroaldosterone (8) and 18,21-anhydro-19-noraldosterone (9).
  • Preparation of 3 alpha, 5 beta-tetrahydro-18,21-anhydro-19-noraldosterone (13) from its ketal derivative.
  • Aldosterone (5) was regenerated from 18,21-anhydroaldosterone (8) in moderate yield.
  • 19-Noraldosterone (10) was obtained in poor yield from 18,21-anhydro-19-noraldosterone (9).

Conclusions:

  • Established synthetic pathways for key anhydroaldosterone derivatives.
  • Demonstrated the feasibility of interconverting these steroid structures.
  • Highlighted differential yields in reverse ring-opening reactions, indicating unique chemical properties of the synthesized compounds.

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