cleavage of the epoxide () of methyl (-)-kaur-9(11)-en-19-oate () with boron trifluoride-ether in benzene and in acetic anhydride yielded () and (), respectively. On epoxidation with -chloroperbenzoic acid in the presence of -nitrosomethyl urea, () suffered a backbone rearrangement to form ().
(-)-kaur-9(11)-en-19-oate()的
环氧化物()用
三氟化硼-醚在苯和
乙酸酐中的裂解分别产生()和()。在-亚硝基甲基
脲存在下,用-
氯过
苯甲酸进行环氧化时,()发生骨架重排,形成()。