Metal-free carbon–carbon cross-couplings between the ion pairs in sulfonium tetraphenylborates
作者:Mei-Li Xu、Wenhua Huang
DOI:10.1016/j.tetlet.2014.05.102
日期:2014.7
A series of sulfonium tetraphenylborates can be readily prepared by the metathesis of sulfonium halides with sodium tetraphenylborates. After heating at 120–150 °C, the sulfonium tetraphenylborates can smoothly undergo the cross-couplings between the tetraphenylborate anions and the sulfonium cations in the absence of a metal catalyst. For carbonylmethyl-, benzyl-, and allylsulfoniums, the corresponding
通过将卤化with与四苯基硼酸钠复分解,可以容易地制备一系列四苯基硼酸bor。在120–150°C加热后,四苯基硼酸sulf可以在没有金属催化剂的情况下平稳地经历四苯基硼酸根阴离子和sulf阳离子之间的交叉偶联。对于羰基甲基,苄基和烯丙基硫,相应的羰基甲基-苯基,苄基-苯基和烯丙基-苯基交叉偶联产物的收率可达22-76%。提出了用于该交叉偶联反应的离子间电子转移机理。