The synthesis and in vitro activity of some δ(7,9(11))-lanostadienes

Bogdan A. Šolaja, Miodrag Ermanović, Lim Dong-Min, Young Ki Paik, Bernard Tinant, Jean Paul Declerq

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The synthesis of Δ(7,9(911))-lanostadiene derivatives functionalized at C(32) starting from 3β-acetoxy-7α,32-epoxylanostan-11-one has been presented. The Δ(7,9(911)) moiety was efficiently introduced in three steps in 71% yield by the regioselective abstraction of allylic 8β hydrogen. The formyl group of the key intermediate, 3β-benzoyloxylanosta-7,9(11)-dien-32- al, has been stereoselectively alkylated into (32S) derivative, whereas its oxidation unexpectedly afforded 3β-benzoyloxy-7-oxolanost-8-ene-32,11α- lactone and not the corresponding acid. δ(7,9(911))-lanostadienes possessing HC(32)=O, C(32)=N, HC(32S)CH3OH, H2C(32)OH, as well as some 11-keto lanostenes, were tested in Vitro against several purified cholesterogenic enzymes showing moderate activity, with most the active aldehyde 16 having IC50 = 86 μm.

Original languageEnglish
Pages (from-to)709-718
Number of pages10
Issue number11
Publication statusPublished - 1997 Nov

Bibliographical note

Funding Information:
The authors from Belgrade wish to thank the Yugoslav Research Fund and Research Fund of Serbia for financial support (Grant S. This work was also supported in part by a grant from Korea Science and Engineering Foundation (KOSEF) through the Bioproducts Research Center at Yonsei University (to YKP).

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Endocrinology
  • Pharmacology
  • Clinical Biochemistry
  • Organic Chemistry


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