Cobalt-catalyzed redox-neutral synthesis of isoquinolines: C–H activation assisted by an oxidizing N–S bond
作者:Fen Wang、Qiang Wang、Ming Bao、Xingwei Li
DOI:10.1016/s1872-2067(16)62491-9
日期:2016.8
A redox-neutral avenue to access isoquinolines has been realized by a Co(Ⅲ)-catalyzed C-H activation process. Starting from readily available N -sulfinyl imine substrates and alkynes, the reaction occurred via N-S cleavage with broad substrate scope and functional group compatibility in the presence of cost-effective cobalt catalysts.
A nickel-catalyzed cycloaddition of aromatic (O-benzyl)ketoximes with alkynes to afford 3,4-disubstituted isoquinoline derivatives has been developed. The reaction involves oxidative addition of N–O bond of O-benzylketoxime to Ni(0) and subsequent intermolecular C–H bond activation via elimination of benzyl alcohol. It was also found that ketoximes participate in the nickel-catalyzed reaction with alkynes to furnish isoquinoline N-oxide derivatives.