A tetracyclic triterpene has been isolated from the oleoresins of four Dipterocarpus species. It has been identified with van Itallie's dipterocarpol and Mills' hydroxy-dammarenone-II (I). The side chain of dipterocarpol has been degraded to the methyl ketone (VII, R = H, by three different methods. Trifluoroperacetic acid converted the ketone into the 17-acetate (XXII, R = H, R′ = Ac), and ring A
从四个双翅类属植物的油性
树脂中分离出了四环三萜。它已被范·伊塔利(van Itallie)的二萜卡普尔和米尔斯(Mills)的羟基-达马利酮-II(I)鉴定。二萜的侧链已通过三种不同的方法降解为甲基酮(VII,R = H),
三氟过氧乙酸将酮转化为17-
乙酸酯(XXII,R = H,R'= Ac),且环A然后通过经典方法将其修饰为药理学上无活性的
睾丸激素类似物(XXX,R = H),并讨论了双萜的立体
化学。