Cu-Catalyzed Silylation of Alkynes: A Traceless 2-Pyridylsulfonyl Controller Allows Access to Either Regioisomer on Demand
作者:Alfonso García-Rubia、Jose A. Romero-Revilla、Pablo Mauleón、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1021/jacs.5b02667
日期:2015.6.3
of the reaction, opening the access to either regioisomer without modification of the starting substrate by virtue of an in situ base-promoted alkyne to allene equilibration which takes place prior to the silylcupration process. Furthermore, removal of the directing SO2Py allows for further elaboration of the silylation products. In particular, a one-pot tandem alkyne silylation/allylic substitution
在炔丙基位置带有 2-吡啶基磺酰基 (SO2Py) 的末端和内部炔烃的 Cu 催化甲硅烷基化以良好的产率提供了广泛的乙烯基硅烷,并且在温和条件下具有出色的区域和立体控制。就反应效率和化学选择性而言,定向 SO2Py 基团是必不可少的。重要的是,该基团还提供了逆转反应区域化学结果的能力,通过在甲硅烷基铜化过程之前发生的原位碱促进炔到丙二烯的平衡,打开了对任一区域异构体的访问,而无需修饰起始底物. 此外,去除定向 SO2Py 允许进一步加工硅烷化产物。特别是,一锅串联炔烃甲硅烷基化/烯丙基取代序列,