Synthesis of 5-selenoxo-1,2,4-triazole-1-carboxylates from isoselenocyanates and azodicarboxylates
A mixture of an azodicarboxylate and triphenylphosphine in dichloromethane reacted with aryl isoselenocyanates (1) at room temperature to give 4,5-dihydro-5-selenoxo-1H-1,2,4-triazole-1-carboxylates (4a-f) in a one-pot reaction in good to excellent yields