A palladium-catalyzed direct ortho-ethoxycarbonylation of azobenzenes and azoxybenzenes with diethyl azodicarboxylate (DEAD) was developed. In the presence of Cu(OAc)2 or (NH4)2S2O8 as the oxidant, this protocol allowed using both electron-deficient and electron-rich azobenzenes and azoxybenzenes to produce the corresponding products in moderate to good yields.
N. Xu, D. Li, Y. Zhang and L. Wang, Org. Biomol. Chem., 2015, 13, 9083 DOI: 10.1039/C5OB01264C
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