Ring Interconversion of 1,3,4-Oxadiazolylacetones

Úlfur Jónsson; Haukur Kristinsson; Hannes Nussbaumer; Vilhjálmur Skúlason; Tammo Winkler

doi:10.1055/s-1995-3994

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

Abstract

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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

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