2(3H)-Oxazolones from α-Hydroxy Amides and Keteneylidenetriphenylphosphorane via a Phoshorus Ylide Cascade
作者:Jonas Löffler、Rainer Schobert
DOI:10.1002/jlac.199719970132
日期:1997.1
activity”. Evidence for the proposed mechanism is provided by trapping the intermediate ylide species with suitable carbonyl compounds. This technique may also be used to exclusively prepare the 2,4-oxazolidinediones 13 in good yields.
在二甲苯中加热后,α-羟基酰胺3与累积的磷内鎓盐1反应,以40-80%的收率得到取代的2(3 H)-恶唑酮8。经由加料/环化/反应的进行间分子Wittig烯化序列,这意味着三种不同类型的增加“叶立德活性”的磷叶立德。通过用合适的羰基化合物捕获中间叶立德物质,为提出的机理提供了证据。该技术还可用于以良好的产率专门制备2,4-恶唑烷二酮13。