Metal-free, efficient hydrazination of imidazo[1,2-a]pyridine with diethyl azodicarboxylate in neutral media.
Wang Y, Frett B, McConnell N, Li HY. Metal-free, efficient hydrazination of imidazo[1,2-a]pyridine with diethyl azodicarboxylate in neutral media. Org Biomol Chem. 2015 Mar 14; 13(10):2958-64.