Two new quassinoids, shinjudilactone and shinjulactone C were isolated from the root bark of Ailanthus altissima SWingle and their structures were established to be 1β,11α-dihydroxy-2,16-dioxo-13(12→11α)abeo-picras-3-en-12,20-olide and 1α,12α : 5α,13α-dicyclo-1β,12β,20-trihydroxy-9βH-picras-3-ene-2,11,16-trione, respectively, by X-ray diffraction analysis. Shinjudilactone was prepared from ailanthone by benzilic acid rearrangement.
从香樟树(Ailanthus altissima SWingle)的根皮中分离出了两种新型的奎士诺类化合物,分别是shinjudilactone和shinjulactone C,并通过X射线衍射分析确定其结构为:1β,11α-二羟基-2,16-二酮-13(12→11α)abeo-picras-3-烯-12,20-内酯和1α,12α : 5α,13α-二环-1β,12β,20-三羟基-9βH-picras-3-烯-2,11,16-三酮。shinjudilactone是通过
苯甲酸重排从香樟酮中制备的。