2003 Isoxazole derivatives

Isoxazole derivativesR 0240 Cycloaddition of Nitrile Oxides to Substituted Vinylphosphonates. — Cycloaddi-

tion of nitrile oxides, generated in situ from hydroxamic chlorides (II) and triethylamine to vinylphosphonates (I) and (IV) proceeds under very mild conditions in excellent regiospecificity to afford the dihydroisoxazoles (III) and (V) in good yields. — (YE*, Y.; XU, G.-Y.; ZHENG, Y.; LIU, L.-Z.; Heteroat. Chem. 14 (2003) 4, 309-311; State Key Lab. Elem.-Org. Chem., Nankai Univ., Tianjin 300071, Peop. Rep. China; Eng.) — H. Hoennerscheid

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