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Abstract
AbstractSome new pyridazinone derivatives(3) were synthesized through addition of antipyrin to β‐aroylacrylic acids (1) followed by cyclization of the adducts. Reactions of 3 with ethyl bromoacetate, benzenesulfonyl chloride, benzoyl chloride and POCl3 give N‐substituted products and monochlorosubstituted pyridazines (4), respectively. The reactions of the latter with thiourea give unexpected dithio‐derivatives (5), which react with phenylhydrazine to give pyrazolopyridazino pyridazine derivatives (6). Reactions of 2 with NH2OH in ethanol and pyridine afford oxime and oxazinone derivatives 7 and 8, respectively. The antibacterial activities of several compounds were screened.
Published Version
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