Cyclization of mangostin with p-toluenesulfonic acid
gave 1-isomangostin, 3-isomangostin, and a new cyclization product,
bicyclomangostin (4). The structure of bicyclomangostin was determined by
spectroscopic and X-ray crystallographic studies. The methyl ether derivatives
(8) and (9) or (10) were produced on methylation of bicyclomangostin,
depending on the method used.
芒果苷与对甲苯磺酸的环化反应
得到了 1-异芒果苷、3-异芒果苷和一种新的环化产物、
双环芒果苷(4)。双环曼戈斯汀的结构是通过
光谱和 X 射线晶体学研究确定了双环芒柄菌素的结构。甲醚衍生物
(8)和(9)或(10)是在双环芒果苷的甲基化过程中产生的、
这取决于所使用的方法。