dehydroroyleanone, and the acetoxyroyleanone was established as follows. Catalytic hydrogenation of the dehydroroyleanone (2 moles of hydrogen were talten up) followed by oxidatioil of the product by air gave royleanone. This indicated that dehydroroyleanone differed froin royleanone only in having an additional double bond. A comparison of the ultraviolet spectra of royleanone (XgIsH 277, 283 (shoulder)
三种相关的二萜
醌类,royleanone、9-乙酰氧基royleanone 和 Y-dehydroroyleanone,已从 Inz-la royleana DC 的根中分离出来,这些已根据降解研究和从
铁杉醇合成 royleanone 指定结构。植物 In~~la royleana DC 是一种多年生灌木,生长在喜马拉雅山脉西部海拔 7,000 至 11,000 英尺的地区。它被认为是有毒的,已被用作
杀虫剂和消毒剂 (I)。已证明其根富含二萜
生物碱 lycoctonine (2-4) 的衍
生物。此外,还报告了黄色
颜料的存在 (5)。我们现在证明的这种
颜料仅由我们称为“royleanones”的二萜醌的混合物组成。次要成分是乙酰氧基酰基酮 (I) (C22H3005)。还存在少量
肉豆蔻酮 (IV) (CzoH28O3) 和脱氢
肉豆蔻酮 (111) (C2OH2603)。这些组合在结构上密切相