Organic Letters
Organic Letters
5 years ago

Palladium-Catalyzed C–H Bond Activation by Using Iminoquinone as a Directing Group and an Internal Oxidant or a Co-oxidant: Production of Dihydrophenanthridines, Phenanthridines, and Carbazoles

Palladium-Catalyzed C–H Bond Activation by Using Iminoquinone as a Directing Group and an Internal Oxidant or a Co-oxidant: Production of Dihydrophenanthridines, Phenanthridines, and Carbazoles
Shih-Ching Chuang, Pei-Ling Chen, Pratheepkumar Annamalai, Yi-Hung Liu, Selvam Raju
A palladium-catalyzed C–H bond activation reaction, via a redox-neutral pathway, for the preparation of dihydrophenanthridine, phenanthridine, and carbazole derivatives from biaryl 2-iminoquinones is developed. The preinstalled iminoquinone was designed to act as a directing group for ortho C–H activation and an internal oxidant or a co-oxidant. This catalysis proceeded through the following sequence: C–H bond activation, coordination and insertion of activated olefins, β-hydride elimination, H-shift, insertion, and protonation or β-hydride elimination. In addition, carbazoles can be prepared efficiently by using this method without the addition of external oxidants.

Publisher URL: http://dx.doi.org/10.1021/acs.orglett.7b01956

DOI: 10.1021/acs.orglett.7b01956

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