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The expected Michael adducts and spiroisoxazolines are obtained from the reaction between 3-methyl-4-nitro-5-styrylisoxazole and bis-enolisable ketones. Contrary to reported data, Michael adducts are obtained in good yields only when a substoichiometric amount of base is used, whereas spiroisoxazolines were obtained as the major product when the base is present in a large excess.
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