Antiproliferative Hybrid Analogs of the Hormone 1α,25-Dihydroxyvitamin D3: Design, Synthesis, and Preliminary Biological Evaluation

Gary H. Posner, Jae Kyoo Lee, M. Christina White, Richard H. Hutchings, Haiyan Dai, Joseph L. Kachinski, Patrick Dolan, Thomas W. Kensler

Research output: Contribution to journalArticlepeer-review


The combination of 10-12 kbar pressure plus Lewis acidic zinc dichloride promotes highly regioselective and stereoselective Diels - Alder cycloaddition between 3-bromo-2-pyrone, prepared in a new way, and unactivated terminal alkene 4-(tert-butyldimethylsiloxy)-1-butene. The conjugate base of A-ring allylic phosphine oxide 20 adds chemospecifically to the C-8 keto group of some C-8,C-24-diketones to form directly metabolically resistant 24-oxo analogs of 1α,25-dihydroxyvitamin D3 (calcitriol). Several of these new hybrid analogs are as efficacious in vitro as calcitriol at inhibiting growth of murine keratinocytes even at physiologically relevant 10-100 nanomolar concentrations.

Original languageEnglish (US)
Pages (from-to)3291-3298
Number of pages8
JournalJournal of Organic Chemistry
Issue number10
StatePublished - Dec 1 1997
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry

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