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Synthesis 1991; 1991(10): 845-848
DOI: 10.1055/s-1991-26588
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A New Method for Synthesis of 1H-Pyrazol-3(2H)-ones

Igor V. Magedov* , Yuri I. Smushkevich
  • *Department of Organic Chemistry, Mendeleev Chemico-Technological Institute, Miusskaya pl. 9, Moscow 125820, USSR
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Publication Date:
29 April 2002 (online)

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A new preparative method is reported for the synthesis of 4,5-disubstituted 1,2-dimethyl-1H-pyrazol-3(2H)-ones 5a-e,g-k from N,N′-diacyl-N,N′-dimethylhydrazines 1a-e,g,h,j,k. The method is based on the intramolecular formation of the 4,5-bond in the pyrazole molecule.