A mixture of diastereomeric 3-acetoxy-(2,3),(19β,28)-diepoxyoleananes was prepared via reaction of 3-acetoxy-19β,28-epoxyolean-2-ene with m-chloroperbenzoic acid. Directed rearrangement of these formed 2β-acetoxy-19β,28-epoxyolean-3-one whereas heating of them in amines produced oleanane-type enamines.
通过3-乙酰氧基-19β,28-环氧齐墩果烷-2-烯与
间氯过氧苯甲酸的反应,制备了非对映异构体3-乙酰氧基-(2,3),(19β,28)-二环氧齐墩果烷的混合物。对这些混合物进行定向重排,得到2β-乙酰氧基-19β,28-环氧齐墩果烷-3-酮,而将其在胺中加热则得到齐墩果烷型烯胺。