Abstract
The synthesis of N-oxides of the cyclic hydrazides of
pyridine and pyrazine o-dicarboxylic
acids is described. Pyrido[2,3-d]pyridazine-5,8-dione 1-oxide, pyrido[3,4-d]pyridazine-1,4-dione
6-oxide, and pyrazino[2,3-d]pyridazine-5,8-dione 1,2-dioxide, were obtained by
direct oxidation of the parent hydrazides with peracetic acid. The
pyridopyridazine derivatives were also unambiguously synthesized by treating
the anhydrides or diesters of the relevant carboxylic acid 1-oxides with
hydrazine hydrate.
Cited by
18 articles.
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