Iridium-catalyzed diborylation of benzylic C–H bonds directed by a hydrosilyl group: synthesis of 1,1-benzyldiboronate esters
作者:Seung Hwan Cho、John F. Hartwig
DOI:10.1039/c3sc52824c
日期:——
We describe a regioselective diborylation of primary benzylic CâH bonds catalyzed by [Ir(COD)OMe]2 and 4,4â²-di-tert-butyl-2,2â²-bipyridine (dtbpy). The hydrosilyl group acts as a traceless directing group, providing access to a range of 1,1-benzyldiboronate esters in good yields. Transformations of the 1,1-benzyldiboronate ester products include chemoselective SuzukiâMiyaura cross-couplings and synthesis of tetrasubstituted alkenyl boronate esters.
我们描述了一种由[Ir(COD)OMe]2和4,4'-二叔丁基-2,2'-联吡啶(dtbpy)催化的苄位一级C-H键的选择性二硼化反应。氢硅烷基团作为无痕导向基团,提供了高产率制备一系列1,1-苄基二硼酸酯的途径。1,1-苄基二硼酸酯产品的转化包括化学选择性的铃木-宫浦交叉偶联反应和制备四取代烯基硼酸酯的合成。