4 years ago

Palladium-Catalyzed Carbonylative Cyclization of Azoarenes

Palladium-Catalyzed Carbonylative Cyclization of Azoarenes
Yahui Li, Zechao Wang, Fengxiang Zhu, Zhiping Yin, Xiao-Feng Wu
In this communication, we established an interesting palladium-catalyzed carbonylation protocol for the intramolecular cyclization of azoarenes. With Mo(CO)6 as the solid CO source and through C(sp2)−H bond activation, a series of azoarenes were transformed into the corresponding 2-arylindazolones in moderate to good yields. Notably, not only symmetrical azoarenes, but also unsymmetrical substrates underwent the reaction with excellent regioselectivity. CO-n game: An efficient protocol for the palladium-catalyzed carbonylation of azobenzenes is established through C(sp2)−H bond activation with Mo(CO)6 as the solid CO source. Reactions of both symmetrical and unsymmetrical azobenzenes proceed efficiently by this procedure with high regioselectivity. BQ=p-benzoquinone.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cctc.201700679

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