Two new alkaloids, aljesaconitine A and aljesaconitine B, and six known alkaloids, aconitine, jesaconitine, mesaconitine, neoline, hokbusine A, and delcosine, were isolated from the roots of Aconitum japonicum THUNB. (formerly known as Aconitum subcuneatum NAKAI). The structures of aljesaconitines A and B were determined on the basis of spectral data and derivation from jesaconitine. An acetoxy group at C-8 of an aconitine-type alkaloid was found to be easily changed to an alkoxy group by the use of alcohols such as methanol and ethanol in the extraction procedure. Quantitative determination and the LD50 values of these 8-O-alkyl derivatives are also described.
从乌头属植物Aconitum japonicum THUNB.(曾用名为Aconitum subcuneatum NAKAI)的根部中分离出两种新
生物碱,即aljesaconitine A和aljesaconitine B,以及六种已知
生物碱,分别是
乌头碱、杰沙
乌头碱、美沙
乌头碱、
尼奥林、hokbusine A和delcosine。根据光谱数据和来源于杰沙
乌头碱的结构推导,确定了aljesaconitines A和B的结构。研究发现,在提取过程中使用
甲醇和
乙醇等
醇类时,乌头型
生物碱C-8位上的
乙酸酯基团很容易转变为烷氧基团。同时,还描述了这些8-O-烷基衍
生物的定量测定和LD50值。