Furan Approach to Vitamin D Analogues. Synthesis of the A-Ring of Calcitriol and 1α-Hydroxy-3-deoxyvitamin D<sub>3</sub>
作者:William H. Miles、Katelyn B. Connell、Gözde Ulas、Hannah H. Tuson、Elizabeth A. Dethoff、Varun Mehta、April J. Thrall
DOI:10.1021/jo101155c
日期:2010.10.15
The A-rings of calcitriol (1 alpha,25-dihydeoxyvitamin D-3) and 1 alpha-hydroxy-3-deoxyvitamin D-3 were synthesized using the furan approach The critical steps in the synthesis of the A-ring of calcitriol involved an asymmetric carbonyl-ene reaction of 3-methylene-2,3-dihydrofuran with 3-(tert-butyldimethylsiloxy)-propanal. a diostereoselective Friedel-Crafts hydroxyalkylation an oxidation of the 2.3-disubstituted furan to give a gamma-hydroxybutenolide and a Peterson olefinatiion The A-ring (Z)-dienol of calcitriol was synthesized in 12 steps from 3-(tert-butyldimethylsiloxy)propanal in 17% yield
Furan approach to the synthesis of the A-ring of Vitamin D analogues
作者:William H. Miles、Katelyn B. Connell
DOI:10.1016/s0040-4039(02)02824-1
日期:2003.2
The efficient transformation of 2,3-disubstituted furan (3) into (Z)-dienol (2) illustrates a useful strategy for the synthesis of the A-ring of Vitamin D analogues.