Palladium-catalyzed highly regio- and stereoselective synthesis of (1E)- or (1Z)-1,2-dihalo-1,4-dienes via haloallylation of alkynyl halides
作者:Xiaoyi Chen、Wei Kong、Haiting Cai、Lichun Kong、Gangguo Zhu
DOI:10.1039/c0cc04879h
日期:——
A highly efficient and selective synthesis of (1E)- or (1Z)-1,2-dihalo-1,4-dienes viaPd-catalyzed coupling of haloalkynes and allylic halides is described. The (1E)-1,2-dihalo-1,4-dienes were generated in good yields with excellent stereoselectivities (1E/1Z up to >98/2), while (1Z)-1,2-dihalo-1,4-dienes were produced in excellent yields and stereoselectivities (1Z/1E up to >98/2) by simply adding stoichiometric lithium halides.
描述了一种高效且选择性强的合成(1E)-或(1Z)-1,2-二卤-1,4-二烯的方法,该方法通过钯催化的卤代炔与烯丙卤化物的偶联反应实现。(1E)-1,2-二卤-1,4-二烯以良好的产率和优异的立体选择性生成(1E/1Z高达>98/2),而(1Z)-1,2-二卤-1,4-二烯则通过简单添加当量的锂卤化物以优秀的产率和立体选择性生成(1Z/1E高达>98/2)。