Synthesis, Biological Activity, and Conformational Analysis of Four <i>seco</i>-<scp>d</scp>-15,19-<i>bisnor</i>-1α,25-Dihydroxyvitamin D Analogues, Diastereomeric at C17 and C20
作者:Xiaoming Zhou、Gui-Dong Zhu、Dirk Van Haver、Maurits Vandewalle、Pierre J. De Clercq、Annemieke Verstuyf、Roger Bouillon
DOI:10.1021/jm980736v
日期:1999.9.1
The synthesis of four CD-ring-modified 19-nor-1alpha, 25-dihydroxyvitamin D(3) derivatives lacking C15, referred to as 6C analogues, and diastereomeric at C17 and C20 is described. The synthesis involves an Ireland-Claisen rearrangement of a 3-methyl-substituted ester of (1R)-3-methyl-2-cyclohexen-1-ol as the key step, followed by elaboration of the side chain, transformation into a C8 cyclohexanone