Abstract
A series of 4-hydroxyl-Δ2-isoxazol-6(6aH)-one derivatives was prepared by magnesium ion-mediated diastereoface-selective 1,3-dipolar cycloaddition of aromatic nitrile oxides with pyrrolidinone derivatives. The reaction of 4-hydroxyl-Δ2-isoxazol-6(6aH)-one derivatives with dimethylsulfoxide and oxalyl chloride under Swern conditions led to a Δ2-isoxazole-4,6(5H,6aH)-dione.
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