External electrolyte-free electrochemical one-pot cascade synthesis of 4-thiocyanato-1H-pyrazoles

A practical synthetic method for 4-thiocyanato-1H-pyrazoles through the electrochemical cascade reaction of hydrazines, 1,3-diones and NH4SCN under metal-, chemical oxidant-and external electrolyte-free conditions was established. Importantly, both a gram-scale synthesis of 4-thiocyanato-1H-pyrazoles and five one-pot sequential transformations starting from hydrazine were successfully accomplished.