An Expedited Approach to the Vitamin D <i>trans</i>-Hydrindane Building Block from the Hajos Dione
作者:Paweł Chochrek、Jerzy Wicha
DOI:10.1021/ol060775y
日期:2006.6.1
Efficient and operationally simple synthesis of the key trans-hydrindane alcohol building block for the synthesis of calicitriol (1 alpha,25-dihydroxyvitamin D(3)) has been developed. Epoxy alcohol prepared almost quantitatively from the Hajos dione was reduced at the quaternary carbon by the Hutchins procedure (NaBH(3)CN-BF(3)(.)Et(2)O). The diol was selectively deoxygenized either using the Barton-McCombie reaction (with Bu(3)SnH-AIBN) or via the respective iodohydrine (with LiAlH(4)).
Total Synthesis of a CD-Ring: Side-Chain Building Block for Preparing 17-<i>epi</i>-Calcitriol Derivatives from the Hajos–Parrish Dione
作者:Karol Michalak、Jerzy Wicha
DOI:10.1021/jo201083w
日期:2011.8.19
An efficient synthesis of the key building block for 17-epi-calctriol from the Hajos-Parrish dione involving a sequence of diastereoselective transformation of the azulene core and the side-chain construction is presented.