Facile and highly regiospecific synthesis of 2-aryl-substituted pyrazolidin-3-ones from α,β-unsaturated N-acylbenzotriazoles and arylhydrazines
The bis-addition of arylhydrazines to α,β-unsaturated N-acylbenzotriazoles to form heterocyclic compounds was achieved in refluxing THF by using triethylamine as promoter. The reaction was highly regioselective and various 2-aryl-substituted pyrazolidin-3