Through our investigation of synthetic routes to tetronicacids, elaboration and cyclization of γ-acetoxy-β-ketoesters were examined. Synthesis of these β-ketoesters 2 has been realized by selective monoacylation of the magnesioenolate of monoethyl malonate. Lactonization of 2 leading to tetronicacids or to 4-alkoxy-furan-2(5H)-ones is reported.
The conversion of olefins to β-keto esters: Ozonolysis of olefins followed by in situ reduction with tin(II) chloride in the presence of ethyl diazoacetate.
作者:Christopher R. Holmquist、Eric J. Roskamp
DOI:10.1016/s0040-4039(00)97786-4
日期:1990.1
β-keto esters by treatment with ozone followed by the addition of tin(H) chloride and ethyldiazoacetate. Monosubstituted olefins are first treated with ozone in the presence of methanol to generate methoxy hydroperoxides. The hydroperoxides are subsequently reduced with tin(II) chloride in the presence of ethyldiazoacetate to produce β-keto esters.