Kopsine and danuphylline alkaloids from Kopsia. biomimetic partial synthesis of danuphylline B

[摘要]：Two new indole alkaloids, 12-methoxykopsine (6) and danuphylline B (7). were obtained from the leaf extract of file Malayan Kopsia species, K. arborea, and their structures established by spectroscopic analysis. An electrochemically-mediated partial synthesis of the ring-opened alkaloid, danuphylline B from the hexacyclic alkaloid, methyl N(1)-de(methoxycarbonyl)chanofructicosinate was carried out.

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