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Preparation of Polyfunctional Indazoles and Heteroarylazo Compounds Using Highly Functionalized Zinc Reagents

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journal contribution
posted on 01.10.2009, 00:00 by Benjamin Haag, Zhihua Peng, Paul Knochel
Readily available 2-chloromethylarylzinc reagents react with functionalized aryldiazonium tetrafluoroborates providing polyfunctional indazoles. Selective metalations of these 2-aryl-2H-indazoles afford new polycyclic aromatics. The performance of a chemoselective addition of diheteroarylzincs to aryldiazonium salts allows an efficient preparation of new heterocyclic azo compounds.