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
A metal-free cross-dehydrogenative coupling of dithiolanes with ketones and indoles has been developed using DDQ as an oxidant. It provides an economical protocol for the synthesis of β-keto dithiolanes and 3-(1,3-dithiolan-2-yl) indoles.