Catalytic Carbocation Generation Enabled by the Mesolytic Cleavage of Alkoxyamine Radical Cations
作者:Qilei Zhu、Emily C. Gentry、Robert R. Knowles
DOI:10.1002/anie.201604619
日期:2016.8.16
weak C−O bond. Spontaneous scission results in the formation of the stable nitroxyl radical TEMPO. as well as a reactive carbocation intermediate that can be intercepted by a wide range of nucleophiles. Notably, this process occurs under neutral conditions and at comparatively mild potentials, enabling catalytic cation generation in the presence of both acid sensitive and easily oxidized nucleophilic
描述了一种新的催化方法,该方法通过烷氧基胺自由基阳离子的介观裂解来获得碳正离子中间体。在此过程中,激发态氧化剂与TEMPO衍生的烷氧基胺底物之间的电子转移会产生带有非常弱的C-O键的自由基阳离子。自发断裂导致形成稳定的硝基自由基TEMPO 。以及可被多种亲核试剂截获的反应性碳正离子中间体。值得注意的是,该过程在中性条件下和相对温和的电势下发生,从而在酸敏感和易氧化的亲核分子同时存在的情况下能够产生催化阳离子。