esters is achieved via a DBU-promoted Michael addition/lactonization/elimination cascade reaction. The reaction mechanism is tentatively elucidated by performing control experiments and high-resolution mass spectrometry analysis, which indicates that the cascade sequence may involve DBU-derived ammonium ylides.
通过
DBU 促进的迈克尔加成/内酯化/消除级联反应,可以轻松地从具有 β,γ-不饱和 α-
酮酯的 α-卤代
硫酯获得 4-aryl-6-oxycarbonyl-2-pyrones。通过进行对照实验和高分辨率质谱分析初步阐明了反应机理,这表明级联序列可能涉及
DBU 衍生的
铵叶立德。