Pd(OAc)2-catalyzed domino reactions of 1,2-dihaloarenes and 2-haloaryl arenesulfonates with Grignard reagents: efficient synthesis of substituted fluorenes
作者:Cheng-Guo Dong、Qiao-Sheng Hu
DOI:10.1016/j.tet.2008.01.020
日期:2008.3
suggested that Pd(leaving group)X associated arynes should be formed first and the sp(3) C-H activation preferentially occurred at benzylic C-(1 degrees )H bonds. The work described here provides a high yield, one-step access to substituted fluorenes from readily available 1,2-dihalobenzenes and 2-haloaryl arenesulfonates and hindered Grignard reagents, and this substituted fluorene-making method may find applications
描述了 Pd(OAc)(2)-催化的 1,2-二卤代苯和 2-卤代芳基芳烃磺酸盐与受阻格氏试剂形成取代芴的多米诺反应,据信该反应通过与钯相关的芳炔中间体发生。发现这种与钯相关的芳烃反应途径有利于钯催化剂中省略膦和 N-杂环卡宾配体的使用,并具有更好的离去基团。我们的研究表明,应首先形成 Pd(离开基团)X 相关联的芳烃,并且 sp(3) CH 活化优先发生在苄基 C-(1 度 )H 键上。这里描述的工作提供了一种高产率、一步法从容易获得的 1,2-二卤代苯和 2-卤代芳基芳烃磺酸盐和受阻格氏试剂中获得取代芴的方法,