Synthesis of 19-noraldosterone, a potent mineralocorticoid

M. Harnik*, Y. Kashman, M. Cojocaru, T. Rosenthal, D. J. Morris

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

19-Noraldosterone has been prepared for biological re-evaluation through an extension of a recent synthesis of 19-hydroxyaldosterone: 21-hydroxy-6β,19-epoxy-4-pregnene-3,20-dion-20-ethylene ketal-18,11β-lactone (1a) was acetylated and then reduced with zinc-acetic acid-isopropanol to the 19-o1 2b. Treatment with sodium acetate transposed the double bond into conjugation, and 2a thus obtained was oxidized with pyridinium chlorochromate to the 19-oxo compound 3. Decarbonylation to the 19-nor lactone 4 was effected by heating with alkali. Protection of the C-3 carbonyl was achieved by ketalization and the resulting mixture of the 5-ene and 5(10)-ene ketals 5 was reduced with DIBAH to the corresponding mixture of the hemiacetals 6. Acid hydrolysis of the latter afforded 19-noraldosterone (7), accompanied by the 18,21-anhydro ketal 8. 19-Noraldosterone in the solid state exists in the cyclic form 7b, which appears to be also the predominant isomer present under conditions of mass spectrometry. [1H]NMR indicates that in chloroform 19-noraldosterone exists mostly as an equilibrium mixture of structures 7a and 7b. Sodium periodate oxidation furnished the γ-etiolactone 9, confirming the 17β configuration in 7.

Original languageEnglish
Pages (from-to)1163-1169
Number of pages7
JournalJournal of Steroid Biochemistry
Volume24
Issue number6
DOIs
StatePublished - Jun 1986

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