Intramolecular Formal <i>oxa</i>-[3 + 3] Cycloaddition Approach to the ABD System of Phomactin A
作者:Kevin P. Cole、Richard P. Hsung
DOI:10.1021/ol030115i
日期:2003.12.1
The ABD-ring of phomactin A was synthesized using an intramolecular formal oxa-[3 + 3] cycloaddion of an alpha,beta-unsaturated iminium salt tethered to a 1,3-diketone. This represents the first time that the 12-membered ring has been formed simultaneously with the 1-oxadecalin and should afford a facile route to the challenging structure of phomactin A. [reaction: see text]
Stereoselective epoxidation of a 5,6,6-trisubstituted cyclohex-2-enone
作者:Gudmundur G. Haraldsson、Leo A. Paquette、James P. Springer
DOI:10.1039/c39850001035
日期:——
Alkaline hydroperoxidation of a cis/trans mixture of 5,6-dimethyl-6-allylcyclohex-2-enone (4 : 1) has led to a pair of epoxides (ratio 3 :1 ) derived only from the cis isomer, whose separation was achieved chromatographically and the relative stereochemistry defined by crystal structure analysis of an ozonolysis product.