Synthesis of the Tricyclic Picrotoxane Motif by an Oxidative Cascade Cyclization
作者:Jingming Cao、Waygen Thor、Shenkun Yang、Mengxun Zhang、Wenli Bao、Lizhi Zhu、Wei Yang、Yuen-Kit Cheng、Chi-Sing Lee
DOI:10.1021/acs.orglett.9b01806
日期:2019.6.21
An oxidative cascade cyclization of β-keto esters has been developed for the construction of the tricyclic picrotoxane motif in a single step, and DFT calculations suggested a possible cationic cyclization mechanism. This cascade cyclization can be operated on a 20 g scale to obtain a 77% total yield of the tricyclic products, which in turn can be converted to versatile intermediates for further elaboration
Development of palladium(II)-catalyzed oxidative cyclization of olefinic keto and/or lactone esters
作者:Ayaka Hibi、Masahiro Toyota
DOI:10.1016/j.tetlet.2009.06.052
日期:2009.8
A highly efficient palladium-catalyzed oxidative cyclization of olefinic keto and/or lactone esters, which features a catalytic cyclization employing one atmosphere of oxygen as a reoxidizing agent, is developed. (c) 2009 Elsevier Ltd. All rights reserved.
Ethyl (1<i>R</i>∗,3a<i>S</i>∗,7a<i>S</i>∗)-Octahydro-7a-methyl-7-oxo-1<i>H</i>-indene-1-acetate Using Tandem Reactions
作者:Richard A. Bunce、Christina R. Harris
DOI:10.1080/00397919608003551
日期:1996.5
Abstract The title compound was prepared in 29.5% overall yield using a five-step sequence involving two tandemreactions. The current work supports the earlier finding that a strong thermodynamic preference exists for an all-cis relationship across the three contiguous stereocenters at C(1), C(3a), and C(7a).