Bench-Stable Stock Solutions of Silicon Grignard Reagents: Application to Iron- and Cobalt-Catalyzed Radical C(sp<sup>3</sup>
)-Si Cross-Coupling Reactions
作者:Weichao Xue、Ryosuke Shishido、Martin Oestreich
DOI:10.1002/anie.201807640
日期:2018.9.10
the preparation of silicon‐based magnesium reagents is reported. The MgBr2 used in the lithium‐to‐magnesium transmetalation step is generated in situ from 1,2‐dibromoethane and elemental magnesium in hot THF. No precipitation of MgBr2 occurs in the heat, and transmetalation at elevated temperature leads to homogeneous stock solutions of the silicon Grignard reagents that are stable and storable in the
据报道,一种可靠的制备硅基镁试剂的方法。锂到镁的过渡金属化步骤中使用的MgBr 2是由1,2-二溴乙烷和元素镁在热THF中原位生成的。加热过程中不会发生MgBr 2的沉淀,并且在高温下的金属转移会导致硅格氏试剂的均质储备溶液,该溶液在冰箱中稳定且可储存。该方法避免了制备硅原核试剂,例如Si-Si和Si-B试剂。新的格氏试剂被用于前所未有的铁和钴催化的未活化烷基溴的交叉偶联反应。这些镁试剂的官能团耐受性极佳。