Electrochemical Cobalt-Catalyzed C–H Oxygenation at Room Temperature
作者:Nicolas Sauermann、Tjark H. Meyer、Cong Tian、Lutz Ackermann
DOI:10.1021/jacs.7b11025
日期:2017.12.27
Electrochemical cobalt-catalyzed C–H functionalizations were achieved in terms of C–H oxygenation under mild conditions at 23 °C. The robust electrochemical C–H functionalization was characterized by ample substrate scope, whereas mechanistic studies provided support for a facile C–H cleavage. The electrochemical cobalt-catalyzed C–H oxygenation proved viable on arenes and alkenes with excellent levels
A simple and efficient salicylaldehyde‐promoted cobalt‐catalyzed protocol for the C‐H alkoxylation of aromatic amides by employing primary alcohols as the coupling partner has been developed. This method utilizes a 8‐aminoquinoline moiety as the directing group and successfully achieves the ortho‐C‐H alkoxylation in moderate to good yields under mild conditions. This protocol features excellent functional tolerance and broad substrate scope including natural product. In addition, the directing group could be easily removed as well.
Pd(<scp>ii</scp>)-catalyzed coupling of C–H bonds of carboxamides with iodoazobenzenes toward modified azobenzenes
alkylated azobenzene derivativesvia the Pd(II)-catalyzed bidentate directing group (DG)-aided C–H activation and functionalization strategy. In the past, the synthesis of biaryl motif-based azobenzenes was accomplished through the traditional cross-coupling reaction involving organometallic reagents and aryl halides or equivalent coupling partners. We have shown the directcoupling of C–H bonds of aromatic/aliphatic