Lactones. Part 16: Lactonization of γ,δ-epoxy esters with p-toluenesulfonic acid monohydrate
作者:Czesław Wawrzeńczyk、Małgorzata Grabarczyk、Agata Białońska、Zbigniew Ciunik
DOI:10.1016/s0040-4020(03)01052-4
日期:2003.8
The reaction of cyclic γ,δ-epoxy esters with p-toluenesulfonic acid monohydrate is described. The reaction carried out in benzene or methylene chloride gave tosyloxy lactones as product. The ethoxy or methoxy lactones were obtained when ethanol or methanol were used as solvent. A mechanism of this lactonization is proposed.
描述了环状γ,δ-环氧酯与对甲苯磺酸一水合物的反应。在苯或二氯甲烷中进行反应,得到甲苯磺酰氧基内酯作为产物。当使用乙醇或甲醇作为溶剂时,获得乙氧基或甲氧基内酯。提出了这种内酯化的机制。