Conformationally restricted hybrid analogues of the hormone 1α,25-dihydroxyvitamin D3: Design, synthesis, and biological evaluation

M. Christina White, Martin D. Burke, Sara Peleg, Henry Brem, Gary H. Posner

Research output: Contribution to journalArticlepeer-review


Four new conformationally restricted hybrid analogues of the hormone 1α-25-dihydroxyvitamin D3 (1,25D3) have been synthesized in a convergent manner by combining enantiomerically pure C,D-ring ketones ( - )-15 and ( - )-17 with racemic 1-hydroxymethyl A-ring phosphine oxide (±)-18. Parent hybrid analogue 6, which combines the calcemia-inactivating 1β-hydroxymethyl A-ring modification with the antiproliferation- activating 20-epi-22-oxa-25-hydroxydiethyl C,D-ring side chain modification, is comparable in potency to 1,25D3 at the low nM level in inhibiting proliferation in a wide assortment of malignant cell lines in vitro with extremely low calcemic activity in vivo. Surprisingly, both conformationally, restricted analogues of 6 (8b and 9b), which incorproate rigidifying units at their 25-hydroxyl side chain termini, retained the desirable antiproliferative, transcriptional, and calcemic activities of the parent compound.

Original languageEnglish (US)
Pages (from-to)1691-1699
Number of pages9
JournalBioorganic and Medicinal Chemistry
Issue number7
StatePublished - 2001

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Pharmaceutical Science
  • Drug Discovery
  • Clinical Biochemistry
  • Organic Chemistry


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