Efficient, versatile and practical palladium-catalyzed highly regioselective ortho-halogenation of azoxybenzenes†
Abstract
A highly efficient and practical strategy for regio-selective ortho-halogenation (I, Br, Cl) of azoxybenzenes with NXS in the presence of palladium catalysts has been developed in good to excellent yields. The reaction proceeds smoothly and can tolerate a variety of functional groups. Moreover, this chemistry can be applied to substrates in at least a gram scale.