Lysidicin A, which has been isolated from Lisidicie rhodostegia possesses complicated structure. A total synthesis of lysidicin A has been achieved and is described herein. The key reaction is single and cascade Claisen rearrangements. (C) 2011 Elsevier Ltd. All rights reserved.
作者:Min-Jing Cheng、Li-Ping Zhong、Chen-Chen Gu、Xu-Jiang Zhu、Bo Chen、Jun-Shan Liu、Lei Wang、Wen-Cai Ye、Chuang-Chuang Li
DOI:10.1021/jacs.0c05479
日期:2020.7.22
The first and asymmetrictotalsynthesis of bioactive bufospirostenin A, an unusual spirostanol with rearranged A/B rings, was accomplished. The synthetically challenging [5-7-6-5] tetracyclic ring system, found in bufospirostenin A and some other natural products, was efficiently constructed by the unique intramolecular rhodium-catalyzed Pauson-Khand reaction of an alkoxyallene-yne. The 11 stereocenters
Semisynthesis of (−)-Bufospirostenin A Enabled by Photosantonin Rearrangement Reaction
作者:Jun Huang、Tingting Cao、Zhongchao Zhang、Zhen Yang
DOI:10.1021/jacs.1c12395
日期:2022.2.16
An enantioselective semisynthesis of (−)-bufospirostenin A is described. The key steps in the synthesis involve use of our proposed biomimetic and diastereoselective photosantonin rearrangementreaction for construction of the 5/7 bicyclic motif, and a Co-catalyzed reversible double-bond isomerization reaction for installing the double bond in the seven-membered ring.
描述了 (-)-bufospirostenin A 的对映选择性半合成。合成的关键步骤包括使用我们提出的仿生和非对映选择性光染色素重排反应构建 5/7 双环基序,以及使用共催化的可逆双键异构化反应在七元环中安装双键。
Syntheses of Bufospirostenin A and Ophiopogonol A by a Conformation-Controlled Transannular Prins Cyclization
Controlling the conformation of medium-sizedrings is challenging because of their flexibility and ring strain effects. Herein, we report non-Curtin–Hammett conditions for the precise control of the conformation of cyclodecenones to effect the first cis-selective transannular Prins cyclization, which enabled concise syntheses of the 5(10→1)abeo-steroids bufospirostenin A and ophiopogonol A in only
Efficient construction of the core framework of lysidicin A via three Claisen rearrangements including a cascade reaction
作者:Yusuke Ogura、Hidenori Watanabe
DOI:10.1016/j.tetlet.2010.04.073
日期:2010.6
A model compound (6) with the core skeleton of lysidicin A was synthesized as a racemate. The key step (8,7) includes three Claisen rearrangements of the triether with phloroglucinols; two of which rearranged in a cascade manner and the other was a simple rearrangement. This one-pot reaction enabled the introduction of three phloroglucinol units at the correct positions and makes the synthetic approach significantly efficient. (C) 2010 Elsevier Ltd. All rights reserved.