mediated by hypervalent iodine reagents. The reaction proceeds via a reductive iodonium Claisen rearrangement of in situ β-pyridinium silyl enol ethers. The aryl groups are derived from ArI(O2CCF3)2 reagents, which are readily accessed from the parent iodoarenes. It is tolerant of a wide range of substitution patterns and the incorporated arenes maintain the valuable iodine functional handle. Mechanistic
α,β-不饱和酮的 α 芳基化构成了强大的合成转化。它最常见的是通过α-卤代烯酮的交叉偶联来实现,但是这种逐步策略需要预官能化的底物和昂贵的催化剂。直接烯酮 CH α-芳基化将提供原子和步骤经济的替代方案,但此类报道很少。在此,我们报告了由高价
碘试剂介导的烯酮的无
金属直接 CH 芳基化。该反应通过原位 β-
吡啶鎓甲
硅烷基烯醇醚的还原
碘鎓克莱森重排进行。芳基衍生自 ArI(O2CCF3)2 试剂,很容易从母体
碘代
芳烃中获得。它可以容忍广泛的取代模式,并且掺入的
芳烃保持了宝贵的
碘功能手柄。