1,3-Dipolar cycloaddition route to oxygen heterocyclic triones
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.