Total Synthesis of the Putative Structure of Stemonidine: The Definitive Proof of Misassignment
作者:Francisco Sánchez-Izquierdo、Pilar Blanco、Félix Busqué,、Ramón Alibés、Pedro de March、Marta Figueredo、Josep Font、Teodor Parella
DOI:10.1021/ol070486p
日期:2007.4.1
[structure: see text] The total synthesis of the putative structure of the Stemona alkaloid stemonidine has been completed. The key transformations include a 1,3-dipolar cycloaddition of a chiral nitrone derived from (S)-prolinol and a spirolactonization process involving the generation of the critical stereocenter. The NMR data of the synthetic material do not match those reported for the natural
[结构:见正文] Stemona生物碱类可莫尼定的推定结构已全部合成。关键的转化包括衍生自(S)-脯氨醇的手性硝酮的1,3-偶极环加成反应以及涉及关键立体中心生成的螺内酰胺化过程。合成材料的NMR数据与天然产物的NMR数据不匹配。结论是分配给加莫尼定的结构是不正确的,必须将其重新分配为加莫斯体碱。