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Synthesis 1995; 1995(7): 805-809
DOI: 10.1055/s-1995-3994
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Ring Interconversion of 1,3,4-Oxadiazolylacetones

Úlfur Í. Jónsson, Haukur Kristinsson* , Hannes Nussbaumer, Vilhjálmur Skúlason, Tammo Winkler
  • *Ciba Crop Protection and Research Services, Physics Department, Ciba-Geigy Ltd., CH-4002 Basel, Switzerland, Fax +41(61)6978458
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Publication Date:
31 December 2000 (online)

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The title compounds 1 undergo a ring rearrangement with hydroxylamine, hydrazines and acidic aqueous medium leading to isoxazoles 3, pyrazoles 5-7 and pyrazolones 10, respectively. The structure of some title compounds reported in the literature are revised to the corresponding pyrazolones 10.

Ring rearrangement of 1,3,4-oxadiazoles giving isoxazoles, pyrazoles and pyrazolones, respectively