Catalytic Coupling between Unactivated Aliphatic C–H Bonds and Alkynes via a Metal–Hydride Pathway
作者:Yan Xu、Michael C. Young、Guangbin Dong
DOI:10.1021/jacs.7b02020
日期:2017.4.26
We report a Rh(I)-catalyzed site-selective coupling between ketone β-C(sp3)-H bonds and aliphatic alkynes using an in situ-installed directing group. Upon hydrogenation or hydration, various β-alkylation or β-aldol products of the ketones are obtained with broad functional group tolerance. Mechanistic investigations support the involvement of a Rh-H intermediate through oxidative addition of Rh(I)
我们报告了使用原位安装的导向基团在酮 β-C(sp3)-H 键和脂肪族炔烃之间进行 Rh(I) 催化的位点选择性偶联。通过氢化或水合,得到具有广泛官能团耐受性的酮的各种β-烷基化或β-羟醛产物。机理研究支持通过将 Rh(I) 氧化加成到 β-CH 键中来参与 Rh-H 中间体。因此,据我们所知,这种转变代表了不饱和烃和未活化的脂肪族 CH 键通过金属氢化物途径进行催化偶联的第一个例子。