Novel Synthesis of 5-Amino-1-arylsulfonyl-4-pyrazolin-3-ones as a New Class of N-Sulfonylated Pyrazoles

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Abstract
A novel synthesis of 5-amino-1-arylsulfonyl-4-pyrazolin-3-ones via intramolecular cyclization of cyanoaceto-N-arylsulfonylhydrazides is reported and the synthetic potential of the method is demonstrated.