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 enantioselective total synthesis of the oral contraceptive desogestrel (2) is described, in which the tetracyclic steroid core is formed by a sequence of two consecutive Heck reactions. Conversion of the known enantiopure diketone 7 led to the chiral bicycle 6 which was used for a diastereoselective intermolecular Heck reaction with vinyliodide 5 to give 15. In the following intramolecular
描述了口服避孕药去氧孕烯(2)的新型对映选择性全合成,其中四环类固醇核心由两个连续的Heck反应序列形成。已知对映体纯二酮7的转化导致手性自行车6,其用于与乙烯碘化物5的非对映选择性分子间Heck反应,得到15。在随后的分子内Heck反应中,形成四环体系,得到4,由其合成装有去氧孕烯(2)。