A revision of the positive sign of the optical rotation and its maximum value of α-eudesmol
摘要:
The ether extract of the liverwort Porella perrottetiana afforded (-)-alpha-eudesmol, which showed an opposite sign of the optical rotation to that found in higher plants. Present work on the absolute configuration and an optical purity of (-)-alpha-eudesmol strongly suggested that the positive values (e.g. + 28.5 degrees) described in many previous papers should be revised. Since the absolute configuration of (-)-alpha-eudesmol was identical to that of (+)-beta-eudesmol found in the higher plants, it was apparent that the expression of the positive sign might be revised to (-)-alpha-eudesmol. The optical purity, reconfirmation of the absolute configuration and synthesis of (-)-alpha-eudesmol will be discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.
Functionalisation of saturated hydrocarbons. Part XI. Oxidation of cedrol, ?- and ?-eudesmol, sclareol, manoyl oxide, 1,9-dideoxyforskolin, methyltrans-dihydroiasmonate, and tetrahydrolinalool by the ?Gif system?
作者:Derek H. R. Barton、Jean-Clauude Beloeil、Annick Billion、Jean Boivin、Jean-Yves Lallemand、Patrick Lelandais、Simone Mergui
DOI:10.1002/hlca.19870700824
日期:1987.12.16
The oxidation of cedrol (1), β- and γ-eudesmol (6 and 7, resp.), sclareol (14) manoyl oxide (15), 1,9-dideoxyforskolin (22) (±)-methyl trans-dihydrojasmonate (28), and tetrahydrolinalool (32) nearly all of natural terpenoid origin, by the ‘Gif system’ has afforded a number of novel products (3, 11, and 12, 16/17, 18/19, 26, 29–31, and ketones corresponding to 34–35, res.). The structures of these compounds
The title compounds have been synthesized. The Huang-Minlon reduction of ketoalcohol XVI has been studied. Improved methods for the preparation of 2-methylcyclohexane-1,4-dione and 4,4-ethylenedioxy-2-methylcyclohexanone have been developed.
Sesquiterpenes isolated from Alpinia speciosa and Alpinia japonica, and their derivatives were found to inhibit histamine- or barium chloride-induced contraction of excised guinea pig ileum when tested by the Magnus method. Major spasmolytic principles contained in those extracts were the sesquiterpenes, β-eudesmol, nerolidol, humulene epoxide II and 4α-hydroxydihydroagarofuran. Relationships between the chemical structures of the sesquiterpenes and their derivatives, and their spasmolytic activities were discussed.
通过马格努斯法测试发现,从白山药和白山药中分离出的倍半萜及其衍生物可抑制组胺或氯化钡引起的切除豚鼠回肠收缩。这些提取物所含的主要解痉成分是倍半萜、β-桉叶油醇、橙花叔醇、环氧化葎草烯 II 和 4α-羟基二氢豨莶草醚。讨论了倍半萜及其衍生物的化学结构与它们的解痉活性之间的关系。
The absolute configuration of eudesmane-type sesquiterpenoids found in the Japanese liverwort Chiloscyphus polyanthos
作者:M Toyota、T Saito、Y Asakawa
DOI:10.1016/s0031-9422(99)00159-4
日期:1999.8
The ether extract of the liverwort Chiloscyphus polyanthos afforded sesquiterpenoids which are enantiomeric to those found in another liverwortLepidoziavitrea. The absolute configurations of the sesquiterpenoids found in the title species were determined by spectroscopic evidence, chemical derivatization and /or X-ray crystallographic analysis.
地草 Chiloscyphus polyanthos 的醚提取物提供了倍半萜类化合物,其与另一种地草 Lepidozia vitrea 中发现的化合物是对映异构体的。在标题物种中发现的倍半萜类化合物的绝对构型是通过光谱证据、化学衍生化和/或 X 射线晶体学分析确定的。
Sugii; Shindo, Yakugaku Zasshi/Journal of the Pharmaceutical Society of Japan, 1930, vol. 50, p. 709,711; dtsch. Ref. S. 103