described. The semisynthetic route provides suitable conditions toward the central 3-spiro-1,2,3,4-tetrahydropiperidine ring connecting the two subunits of the highly congested structure. The biomimetic assembly by a Diels–Alder or alternatively an imino-Rauhut–Currier reaction affords the natural (S)-diastereomer of leucoridine A as the sole product. The sequence, repeated in a one-pot cascade, supports a
描述了 Leucoridine A 的三步仿生组装,这是一种 Leuconotis griffithi(夹竹桃科)的假对称双
吲哚。半合成路线为连接高度拥挤结构的两个亚基的中心 3-spiro-1,2,3,4-四氢
哌啶环提供了合适的条件。通过 Diels-Alder 或亚
氨基-Rauhut-Currier 反应进行的仿生组装提供了亮
氨酸 A 的天然 (S)-非对映异构体作为唯一产物。该序列在一锅级联中重复,支持该双
吲哚和已知相关
生物碱组装的非酶促途径。