BF3·Et2O promoted conjugate addition of ethanethiol to electron-deficient alkynes
作者:Qing Fa Zhou、Xue Ping Chu、Shen Zhao、Tao Lu、Wei Fang Tang
DOI:10.1016/j.cclet.2012.04.008
日期:2012.6
Abstract An effective method for the synthesis of vinyl thioethers through the conjugate addition of ethanethiol to electron-deficient alkynes promoted by BF 3 ·Et 2 O has been developed. Electron-deficient internal alkynes react with ethanethiol in this system to yield mainly Z -isomer of vinyl thioether adducts, while electron-deficient terminal alkynes afford mainly E -isomer of vinyl thioether
Tributylphosphine-catalyzed reaction of ethanethiol with alkynyl ketones
作者:Shen Zhao、Qing Fa Zhou、Jia Zhi Liu、Wei Fang Tang、Tao Lu
DOI:10.1016/j.cclet.2010.11.007
日期:2011.4
A stereoselective and effective method for the synthesis of vinyl thioethers has been developed. This method is based on the Michael addition of ethanethiol to various alkynyl ketones using 10 mol% of tributylphosphine as catalyst. Most of alkynyl ketones react with ethanethiol in this system to yield mainly Z-isomer of vinyl thioether adducts, only in one case mainly E-isomer of vinyl thioether adducts was observed. (C) 2010 Qing Fa Zhou. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
Regio- and Stereoselective Synthesis of Multisubstituted Olefins and Conjugate Dienes by Using α-Oxo Ketene Dithioacetals as the Building Blocks
palladium(0)-catalyzed, Cu(I)-mediated synthetic route to trisubstituted olefins and conjugate dienes has been developed via oxo directing Liebeskind–Srogl cross-coupling reactions of gem-dihaloolefin-type α-oxo ketene dithioacetals with aryl and alkenylboronic acids. The synthetic protocol has demonstrated rare examples of transition-metal-promoted transformations of ketene dithioacetals, providing a novel route to