The amide acetal condensation of propargyl alcohols: synthesis of γ-keto esters and silyl allenes under mild conditions
作者:Kathlyn A. Parker、Raymond W. Kosley
DOI:10.1016/s0040-4039(00)93726-2
日期:1976.1
In this communication we report the first example of a Claisen rearrangement involving an enamine as the allyl double bond and a general, high yield synthesis of silyl allenes.
Novel 1α,25-Dihydroxyvitamin D<sub>3</sub> Analogues with the Side Chain at C12
作者:Xosé C. González-Avión、Antonio Mouriño、Natacha Rochel、Dino Moras
DOI:10.1021/jm049016g
日期:2006.3.1
The plethora of actions of 1 alpha,25(OH)(2)D-3 in various systems suggested wide clinical applications of vitamin D nuclear receptor (VDR) ligands in treatments of inflammation, dermatological indication, osteoporosis, cancers, and autoimmune diseases. More than 3000 vitamin D analogues have been synthesized in order to reduce the calcemic side effects while maintaining the transactivation potency of the natural ligand. In light of the crystal structures of the vitamin D nuclear receptor (VDR), novel analogues of the hormone 1 alpha,25(OH)2D3 with side chains attached to C-12 were synthesized via the convergent Wittig-Horner approach. Among the compounds studied, the analogue 2b showed the highest binding affinity for VDR and was the most potent at inducing VDR transcriptional activity in a transient transfection assay (20% of the transactivation activity of the natural ligand).
Reactions of propargyl alcohols with amide acetals
作者:Kathlyn A. Parker、Joseph J. Petraitis、Raymond W. Kosley、Stephen L. Buchwald