作者:J.W. Scheeren、J. Lange
DOI:10.1016/s0040-4039(01)90024-3
日期:1984.1
The cycloaddition of α,β-epoxyaldehydes or ketones () with the ketene acetal MeHC=C(OMe)2 () gives epoxyoxetanes () in high yields. Without isolation they can be transformed into 4-hydroxy-5-(1-hydroxyalkyl)-γ-butyrolactones () via the epoxy esters and trihydroxy esters (). The lactones appear to be valuable precursors for the synthesis of 5-(1-hydroxyalkyl)-3-methyl-2-5H-furanones () and 3-methyl-
α,β-环氧醛或酮()与乙烯酮缩醛MeHC = C(OMe)2()的环加成反应可高收率地得到环氧乙烷酮()。不分离它们可以转化成4-羟基-5-(1-羟烷基)-γ丁内酯()通过环氧酯和三羟基酯()。内酯类似乎是5-(1-羟烷基)的合成前体的有价值-3-甲基2-5 ħ -呋喃酮()和3-甲基-5-亚基-2-5 ħ -呋喃酮()