SELECTIVE OXIDATION OF ALLYLIC METHYLS IN MEDIUM RING COMPOUNDS
作者:Baldev R. Chhabra、Kiyoharu Hayano、Toshikazu Ohtsuka、Haruhisa Shirahama、Takeshi Matsumoto
DOI:10.1246/cl.1981.1703
日期:1981.12.5
Allylic methyls in medium ring compounds were selectively oxidized to primary alcohols and αβ-unsaturated aldehydes by means of t-butylhydroperoxide and selenium dioxide supported on silica gel.
Weitere diterpene mit helifulvan-gerüst und andere inhaltsstoffe aus Helichrysum chionosphaerum
作者:Ferdinand Bohlmann、Wolf-Rainer Abraham、William S. Sheldrick
DOI:10.1016/0031-9422(80)85128-4
日期:——
Abstract The aerial parts of Helichrysumchionosphaerum afforded, in addition to known compounds, a humulene alcohol, an abietane derivative, atisirenic acid and two further representatives of a new class of diterpenes. The structure of the basic acid, named helifulvanic acid, was elucidated by NMR studies and by X-ray analysis. The chemotaxonomic importance of these diterpenes is discussed briefly.
摘要 除已知化合物外,蜡菊的地上部分还提供葎草烯醇、松香烷衍生物、二萜酸和另外两种新型二萜的代表。通过核磁共振研究和 X 射线分析阐明了碱性酸的结构,命名为 helifulvanic 酸。简要讨论了这些二萜的化学分类学重要性。
α-Humulene derivatives including a sesquiterpene acid with a rearranged carbon skeleton from Lychophorora columnaris
作者:Ferdinand Bohlmann、Christa Zdero、Harold Robinson、Robert M. King
DOI:10.1016/0031-9422(82)83166-x
日期:——
Abstract An investigation of Lychnophora columnaris afforded in addition to known compounds six new α-humulene derivatives and a rearranged sesquiterpene with a newcarbonskeleton. These compounds and several sesquiterpenelactones isolated from this species seem to be of chemotaxonomic importance. The structures were elucidated by spectroscopic methods and a few chemical transformations including partial