Enantioselective Total Synthesis of the Oral Contraceptive Desogestrel by a Double Heck Reaction
作者:Lutz F. Tietze、Ilga K. Krimmelbein
DOI:10.1002/chem.200700182
日期:2008.2.8
A novel enantioselectivetotalsynthesis of the oralcontraceptivedesogestrel (2) is described, in which the tetracyclic steroid core is formed by a sequence of two consecutive Heckreactions. Conversion of the known enantiopure diketone 7 led to the chiral bicycle 6 which was used for a diastereoselective intermolecular Heckreaction with vinyliodide 5 to give 15. In the following intramolecular