Leuconicines A−G and (−)-Eburnamaline, Biologically Active Strychnan and Eburnan Alkaloids from <i>Leuconotis</i>
作者:Chew-Yan Gan、Yun-Yee Low、Tadahiro Etoh、Masahiko Hayashi、Kanki Komiyama、Toh-Seok Kam
DOI:10.1021/np900576b
日期:2009.12.28
Seven newindolealkaloids of the Strychnos type, leuconicines A−G (1−7), and a new eburnan alkaloid, (−)-eburnamaline (8), were isolated from the stem-bark extract of two Malayan Leuconotis species. The structures of these alkaloids were established using NMR and MS analysis and in the case of 8 also by partialsynthesis. Alkaloids 1−5 reversed multidrug resistance in vincristine-resistant KB cells