We have developed an efficient method for direct formation of epoxide groups from carbon(sp2)–carbon(sp3) single bonds of β-keto esters; the reaction is mediated by the water-soluble hypervalent iodine(V) reagent AIBX (5-trimethylammonio-1,3-dioxo-1,3-dihydro-1λ5-benzo[d][1,2]iodoxol-1-ol anion). On the basis of the results of density functional theory calculations and experimental studies, we propose
Lewis acid catalyzed vinylogous Mukaiyama–Michael (VMM) reactions between 2-(trialkylsilyloxy)furans 1 and α,β-unsaturatedcyclic enones 2 or oxo esters 4 have been investigated. Both substrates proved to be useful Michael acceptors in the title reaction, giving the butenolides 3 and 5 in good yields. A comparative study between the α,β-unsaturatedcyclic enones 2 and the oxo esters 4 as Michael acceptors
Studies on diels-alder reactions of 1,3,3-trimethyl-2-vinylcyclohexene with 2-cyclohexenones
作者:Thomas A. Engler、UmaShanker Sampath、David Vander Velde、Fusao Takusagawa
DOI:10.1016/s0040-4020(01)88309-5
日期:1992.1
The ZnBr2-catalyzed reaction of 1,3,3-trimethyl-2-vinylcyclohexene (4) with 2-carbomethoxy-4,4-dimethyl-2-cyclohexenone at high pressure (12 kbar) produces the expected Diels-Alder product. However, reactions of (4) with the more sterically demanding dienophile (5a) give products of apparent Michael reaction followed by proton transfer.
Total Syntheses of Drimane-Type Sesquiterpenoids Enabled by a Gold-Catalyzed Tandem Reaction
作者:Hang Shi、Lichao Fang、Ceheng Tan、Lili Shi、Weibin Zhang、Chuang-chuang Li、Tuoping Luo、Zhen Yang
DOI:10.1021/ja206837j
日期:2011.9.28
Development of a gold-catalyzed tandem reaction of 1,7-diynes with both internal and external nucleophiles was realized, which constructed five chemical bonds, two rings, and two stereogenic centers in a single step. Based on the novel cascade transformation, we achieved a unified strategy toward the stereoselective total syntheses of C-15 oxygenated drimane-type sesquiterpenoids and their analogues
METHOD FOR CHEMICAL SYNTHESIS OF ANTROCIN AND USE THEREOF FOR SUPPRESSING NON-SMALL CELL LUNG CANCER
申请人:TZENG YEW-MIN
公开号:US20140350096A1
公开(公告)日:2014-11-27
The present invention provides a method for preparing antrocin of pharmaceutically acceptable salts thereof via a series of gold-catalyzed cyclization to construct the (6-6-5) tricyclic core frame. The present invention also provides a use of a composition in preparing drugs for suppressing growth of non-small cell lung cancer cells, wherein the composition comprises an effective amount of antrocin or pharmaceutically acceptable salts thereof and a pharmaceutically acceptable carrier.