Synthetic studies on Stemona alkaloids. Construction of the sessilifoliamides B and C and 1,12-secostenine skeleton
作者:Javier Alonso-Fernández、Cristina Benaiges、Eva Casas、Ramon Alibés、Pau Bayón、Félix Busqué、Ángel Álvarez-Larena、Marta Figueredo
DOI:10.1016/j.tet.2016.04.077
日期:2016.6
An original synthetic approach to the Stemona alkaloids stenine and sessilifoliamides B and C has been explored. The strategy relies on the early construction of the pyrroloazepine core (rings A and B) and latter addition of the furanone (ring D) and ethyl chain at C-10, which are the common structural features of the three alkaloids. The formation of the azabicyclic nucleus through an intramolecular
Stemona的原始合成方法已经研究了生物碱类斯汀宁和倍半硅氧烷B和C。该策略依赖于吡咯并ze庚核核心(环A和B)的早期构建以及后来在C-10处添加呋喃酮(环D)和乙基链,这是这三种生物碱的共同结构特征。通过对底物进行修饰,对通过适当取代的吡咯烷酮的分子内Morita-Baylis-Hillman反应形成氮杂双环核进行了广泛研究,并开发了该过程中涉及的所有参数,并开发了产率和立体选择性方面的有效方案。尽管已探索了许多替代策略,但在最后的合成步骤中发现了无法克服的困难,挫败了合成的完成。但是,在此过程中,制备了许多新化合物,