A tag removalâcyclisation sequence is described that is initiated by reduction using a Sm(II) species and completed by a Sm(III) Lewis acid that is formed in an earlier stage. Therefore, the reaction cascade utilises both oxidation states of a samarium reagent in discrete steps and allows access to privileged, pyrrolidinyl-spirooxindole scaffolds and analogues inspired by the anti-cancer natural product spirotryprostatin A.
描述了一种去标签-环化序列,该序列由Sm(II)物种的还原启动,并由在早期阶段形成的Sm(III)
路易斯酸完成。因此,该反应级联利用了
钐试剂的两种氧化态,通过离散步骤实现,并允许获得特权的
吡咯烷基-螺氧
吲哚骨架及其类似物,这些骨架及其类似物的灵感来自抗癌
天然产物螺状
丙烯酰胺A。