Abstract
Reaction between aryl 1,3-diketoesters 2a-e and hydroxylamine hydrochloride has been investigated under different experimental conditions. Whereas acid conditions gave principally 3,5-isoxazole esters (3a-e), reactions under neutral and basic conditions led to different 4,5 and 2,3-dihydro-hydroxy-isoxazoles 4a-e and 5a-e.
Keywords: Isoxazoles, dihydro-hydroxy-isoxazoles, aryl 1,3-diketoesters, hydroxylamine
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