作者:Raymond C. F. Jones、Kathryn A. M. Duller、Simone I. E. Vulto
DOI:10.1039/a707282a
日期:——
1,3-Dipolar cycloadditon of nitrile oxides, formed in situ by dehydration of primary nitro compounds, with pyrrolidine enamines of protected γ-hydroxy-β-keto esters affords isoxazole-4-carboxylates; these are subjected to N–O bond cleavage and lactonisation to afford 3-acyltetronic acids and 3-acyl-4-hydroxytetrahydropyran-2-ones.
腈类氧化物的1,3-二极环加成,由初级硝基化合物脱水原位形成,与受保护的γ-羟基-β-酮酯的吡咯烷胺形成异恶唑-4-羧酸酯;这些异恶唑-4-羧酸酯经过N-O键断裂和内酯化反应,生成3-酰基四氢呋喃酸和3-酰基-4-羟基四氢吡喃-2-酮。