A cycloaddition approach to 3-acyltetramic and 3-acyltetronic acids

Abstract
1, 3-Dipolar cycloaddition of nitrite oxides to enamines formed from protected γ-amino- or γ-hydroxy-β-keto esters affords isoxazolecarboxylic esters that can be converted into 3-acyltetramic acids via dihydropyrroloisoxazol-4-ones, or into 3-acyltetronic acids.

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