Spiro-Fused (C2)-Azirino-(C4)-pyrazolones, a New Heterocyclic System. Synthesis, Spectroscopic Studies and X-ray Structure Analysis1

W Holzer, RM Claramunt…

Index: Holzer, Wolfgang; Plagens, Brigitte Scientia Pharmaceutica, 1996 , vol. 64, # 3-4 p. 455 - 462

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Citation Number: 26

Abstract

Reaction of 1-substituted 4-acyl-5-hydroxy-3-methyl-1 H-pyrazoles (2) with hydroxylamine gives the corresponding “oximes” 3, which are mainly present as (Z)-2, 4-dihydro-4- [(hydroxyamino) methylene]-3 H-pyrazol-3-ones. Treatment of compounds 3 with