α-Santonin was stereoselectively converted to a pair of diastereomers of 2,6-dimethyl-6-(8-methyl-4-methylene-7-nonenyl)-2-cyclohexen-1-ylmethanols (Ia and Ib). Both spectral data of Ia and Ib were found to be different from those reported for magydar-2,10(20),13-trien-17-ol isolated from Magydaris panacifolia (Vahl) Lange, This indicates that the structure of the natural diterpene must be revised.
α-Santonin 立体选择性地转化为一对 2,6-二甲基-6-(8-甲基-4-亚甲基-7-
壬烯基)-2-
环己烯-1-基
甲醇的非对映异构体(Ia 和 Ib)。发现 Ia 和 Ib 的光谱数据与报道的从 Magydaris panacifolia (Vahl) Lange 分离的 Magydar-2,10(20),13-trien-17-ol 的光谱数据不同,这表明天然二萜的结构必须修改。