Studies on the constituents of the plants of illicium species. III. Structure elucidations of novel phytoquinoids, illicinones and illifunones from Illicium tashiroi Maxim. and I. arborescens Hayata.
Studies on the constituents of the plants of Illicium species. IV. Thermal and photochemical reactions of illicinone-A, a novel phytoquinoid from Illicium plants.
作者:KENICHI YAKUSHIJIN、HIROSHI FURUKAWA、ANDREW T. MCPHAIL
DOI:10.1248/cpb.32.23
日期:——
Conversion of illicinone-A (1) to illicinole (4) and the reverse reaction (4→1) were occurred thermally and photochemically, respectively. The photochemical reaction of illicinone-A (1) led to the formation of 5 and 6, having novel carbon skeletons. The structure of 5 was established by X-ray analysis.
伊利西酮-A(1)转化为伊利西烯(4)和逆反应(4→1)分别是通过热反应和光化学反应发生的。伊利西酮-A (1) 的光化学反应生成了具有新型碳骨架的 5 和 6。通过 X 射线分析确定了 5 的结构。
Enantioselective <i>para</i>-Claisen Rearrangement for the Synthesis of <i>Illicium</i>-Derived Prenylated Phenylpropanoids
作者:Joshua A. Homer、Irene De Silvestro、Eilidh J. Matheson、Jake T. Stuart、Andrew L. Lawrence
DOI:10.1021/acs.orglett.1c00620
日期:2021.5.7
The development of the first enantioselective para-Claisen rearrangement has been achieved. Using a chiral aluminum Lewis acid, illicinole is rearranged to give (−)-illicinone A (er 87:13), which can then be converted into more complex Illicium-derived prenylated phenylpropanoids. The absolute configurations of the natural products (+)-cycloillicinone and (−)-illicarborene A have been determined, and
Studies on the constituents of the plants of illicium species. III. Structure elucidations of novel phytoquinoids, illicinones and illifunones from Illicium tashiroi Maxim. and I. arborescens Hayata.
Chemical constituents of the leaves of Illicium tashiroi and I. arborescens (Illiciaceae) were examined. Novel phytoquinoids, (+)-illicinone-A (1a), -B (2a), -C (3a), and -D (4a), and illifunone-A (5a) and -B (5b) were isolated from I. tashiroi, and characterized. As constituents of I. arborescens, enantiomers (1b and 2b) of (+)-illicinone-A (1a) and -B (2a), and diastereoisomers (2c, 3b, 4b, and 4c) of (+)-illicinone-B (2a), -C (3a), and -D (4a) were characterized. The absolute stereochemistry of (-)-illicinone-A was established by analysis of the circular dichroism (CD) spectra of the α-hydroxy ketones (15 and 16) derived from 1b. The stereochemistries of other illicinones and illifunones deduced from the chemical and/or biogenetic correlations.