作者:Akhtar Haider、Hugo Wyler
DOI:10.1002/hlca.19830660220
日期:1983.3.16
Methylation of ethyl 2, 4-dioxopentanoate with diazomethane gives a mixture of two enol ethers, the 2-methoxy and the 4-methoxy isomer, with a product ratio which depends upon reaction temperature. Both enol ethers, initially (Z)-configurated, isomerize to the corresponding (E)-conformers, the 4-methoxy compound with particular ease.
2,4-二氧戊酸乙酯与重氮甲烷的甲基化反应得到两种烯醇醚的混合物,即2-甲氧基和4-甲氧基异构体,其产物比取决于反应温度。最初(Z)-构型的两种烯醇醚都特别容易异构化为相应的(E)-构型异构体,即4-甲氧基化合物。