Functionalisation of terpenoids at C-4 via organopalladium dimers: cyclopropane formation during oxidation of homoallylic σ-organopalladium intermediates with lead tetraacetate
作者:Susana S. Ramos、Paulo Almeida、Lina Santos、William B. Motherwell、Tom D. Sheppard、Maria do Céu Costa
DOI:10.1016/j.tet.2007.10.016
日期:2007.12
equatorial aldehyde functionality was successfully introduced into the lanosterol skeleton as expected. Cyclopalladation of a cholesterol derivative proceeded as expected, but during oxidation of the organopalladium intermediate, participation of the adjacent alkene functionality led to stereoselective formation of a cyclopropane and introduction of an acetate group into the steroid backbone at C-6. Further