Copper-Catalyzed Double C(sp<sup>3</sup>)–Si Coupling of Geminal Dibromides: Ionic-to-Radical Switch in the Reaction Mechanism
作者:Hamideh Hazrati、Martin Oestreich
DOI:10.1021/acs.orglett.8b02281
日期:2018.9.7
A method for converting geminal dibromides into 1,1-disilylated alkanes is reported. The reaction is promoted by a copper(I) catalyst generated in situ from CuBr·SMe2 as a precatalyst and 4,4′-di-tert-butyl-2,2′-bipyridine (dtbpy) as a ligand. A Si–B reagent is used as the silicon pronucleophile. It is shown that the two C(sp3)–Si bond-forming events differ in mechanism, with the first being ionic
报道了一种将双核二溴化物转化为1,1-二甲硅烷基化的烷烃的方法。由CuBr·SMe 2作为前催化剂和4,4'-二叔丁基-2,2'-联吡啶(dtbpy)原位生成的铜(I)催化剂促进了反应。Si-B试剂用作硅亲核试剂。结果表明,两个C(sp 3)-Si键形成事件的机理不同,第一个是离子性的,第二个是自由基的。