temperature generated the corresponding amide enolates. The aromatic [3,3] rearrangement of the enolates provided the desired products in moderate to good yields. A crossover experiment produced only intramolecular products and clarified that the reaction proceeds via the aromatic [3,3] sigmatropic rearrangement, not a bond-cleavage–recombination process. Our method is a formal α-arylation of amides.
成功地证明了碱促进的N-酰基-O-芳基
羟胺的芳香族[3,3]σ重排,得到α-(2-羟苯基)酰胺。由N-取代的
羟胺先进行N-酰化,再由
铜(I)介导的O制备底物-与
硼酸芳基化。在0°C至室温下,在THF中用六甲基二
硅叠氮化
锂(Li
HMDS)处理底物,生成相应的酰胺烯酸酯。烯醇化物的芳族[3,3]重排以中等至良好的产率提供了所需的产物。交叉实验仅产生分子内产物,并澄清了反应是通过芳香族[3,3]σ重排进行的,而不是通过键断裂-
重组过程进行的。我们的方法是酰胺的形式α-芳基化。