Liu, Lei Carroll, Patrick J. Kozlowski, Marisa C. Vanadium-Catalyzed Regioselective Oxidative Coupling of 2‑Hydroxycarbazoles The first regioselective oxidative coupling of 2-hydroxycarbazoles is described. With a vanadium catalyst and oxygen as the terminal oxidant, dimers with an ortho–ortho′ coupling pattern were obtained with high selectivity. Further oxidation led to ortho′–ortho′ coupling to generate a tetramer, which provided insight that the atropisomerization barriers of the unsymmetrical biaryl bonds are much lower than expected. Regioselective;insight;selectivity;dimers;atropisomerization barriers;Oxidative;terminal oxidant;vanadium catalyst;hydroxycarbazole;oxidation;HydroxycarbazolesThe;unsymmetrical biaryl bonds;tetramer;regioselective oxidative;ortho;pattern 2016-01-15
    https://acs.figshare.com/articles/journal_contribution/Vanadium_Catalyzed_Regioselective_Oxidative_Coupling_of_2_Hydroxycarbazoles/2063745
10.1021/ol503521b.s001