Strychnan and Secoangustilobine A Type Alkaloids from <i>Alstonia spatulata.</i> Revision of the C-20 Configuration of Scholaricine
作者:Shin-Jowl Tan、Yun-Yee Low、Yeun-Mun Choo、Zanariah Abdullah、Tadahiro Etoh、Masahiko Hayashi、Kanki Komiyama、Toh-Seok Kam
DOI:10.1021/np100552b
日期:2010.11.29
A total of 25 alkaloids were isolated from the leaf and stem-bark extracts of Alstonia spatulata, of which five are new alkaloids of the strychnan type (alstolucines A−E, 1−5) and the other, a new alkaloid of the secoangustilobine A type (alstolobine A, 6). The structures of these alkaloids were established using NMR and MS analysis and, in the case of alstolucine B (2), also confirmed by X-ray diffraction
共有25种生物碱是从叶分离茎皮的提取物鸡骨常山spatulata,其中5个是strychnan类型(alstolucines A-E,新生物碱1 - 5),另一个中,secoangustilobine A的新生物碱类型(alstolobine A,6)。这些生物碱的结构是使用NMR和MS分析建立的,在alstolucine B(2)的情况下,也通过X射线衍射分析得到了证实。通过NMR和X射线分析对学者(13)的立体化学分配进行了重新研究,结果表明C-20的构型需要修正。生物碱1,2,6,7,9,10,和13逆转耐长春新碱的KB细胞多药耐药性。