作者:Yousuke Yamada、Mariko Kitajima、Noriyuki Kogure、Hiromitsu Takayama
DOI:10.1016/j.tet.2008.06.030
日期:2008.8
Four new gelsedine-type oxindole alkaloids (1–4) were isolated from the leaves and branches of Gelsemium elegans, together with 10 known alkaloids. The structures of the new alkaloids were determined by spectroscopic analyses and partial synthesis from known compounds. Gelsecrotonidine (1), 14-hydroxygelsecrotonidine (2), and 11-methoxygelsecrotonidine (3) possess an additional C2 unit with an acetic
四个新gelsedine型羟吲哚生物碱(1 - 4)从叶和枝条中分离钩吻用10种已知的生物碱,在一起。通过光谱分析和由已知化合物的部分合成来确定新生物碱的结构。相较于与糊精相关的单萜类吲哚生物碱,Gelsecrotonidine(1),14-羟基gelsecrotonidine(2)和11-甲氧基gelsecrotonidine(3)具有一个带有乙酸残基的C 2单元。14-羟基gelsedilam(4)是一种18,19-nor型单萜吲哚生物碱。