inverted indole moiety. The first intermediate along this route turned out to be identical with natural (−)-serratoline (5), and a rearrangement product thereof corresponded to (+)-aristotelone (6), an alkaloid that has been isolated by others from Aristotelia chilensis in 1976. Our investigations unambiguously confirmed the tentative structure of this metabolite, which is endowed with a spiro[4.4]nonane-3-oxindole
合成(+) - aristoteline(2)转化到( - ) - alloaristoteline(1)在4个步骤86%的总产率。这种成功的仿生互变建立了这种不寻常的
天然产物的先前未知的绝对构型,其中该
天然产物含有一个反向的
吲哚部分。沿这条路线的第一中间体与天然(-)-erratoline(5)相同,其重排产物对应于(+)-aristotelone(6),这是一种
生物碱,已被其他人从Aristotelia chilensis分离出。 1976年。我们的研究明确证实了这种代谢产物的暂定结构,该结构具有螺环[4.4]
壬烷-3-氧
吲哚亚基。