Reaction of (E/Z)-1-bromopropene with exactly 1.42 equivalents of nBuLi followed by addition of water produces in situ a THF solution of propyne. Addition of a vinylic or aromatic halogenated substrates, Pd(PPh3)2Cl2, CuI and an amine to this solution give high yield of the corresponding coupling product bearing a propyne moiety. This practical procedure avoids the use of expensive and inflammable propyne gas which need a special apparatus for bubbling it into the reaction flask.
(E/Z)-1-
溴丙烯与正好 1.42 个当量的 nBuLi 反应,然后加
水,在原位生成
丙炔的 THF 溶液。在该溶液中加入
乙烯基或芳香族卤化底物、Pd(PPh3)2Cl2、CuI 和胺,可得到高产率的带有
丙炔分子的相应偶联产物。这种实用的方法避免了使用昂贵且易燃的
丙炔气体,因为这种气体需要一种特殊的装置将其鼓入反应烧瓶中。